#restraint.device__constraint  a device that stops something from moving; "the car did not have proper restraints fitted"
  supertype:  device  an instrumentality invented for a particular purpose; "the device is small enough to wear on your wrist"; "a device intended to conserve water"
  subtype:  air_bag  a safety restraint in an automobile; the bag inflates on collision and prevents the driver or passenger from being thrown forward
  subtype:  dive_brake__airbrake  a small parachute or articulated flap to reduce the speed of an aircraft
  subtype:  arrester_hook__arrester  a restraint that slows airplanes as they land on the flight deck of an aircraft carrier
  subtype:  band.restraint  put around something to hold it together
     subtype:  brake_band__brakeband  a band that can be tightened around a shaft to stop its rotation
     subtype:  collet  a band or collar that holds an individual stone in a jewellery setting
     subtype:  withe  band or rope made of twisted twigs or stems
  subtype:  brake  a restraint used to slow or stop a vehicle
     subtype:  airbrake  a vehicular brake that operates by compressed air; especially for heavy vehicles
     subtype:  brake_system__brakesystem__brakes__brake  brake consisting of a combination of interacting parts that work to slow a motor vehicle
        subtype:  hydraulic_brake__hydraulicbrake__hydraulic_brakes  brake system in which a brake pedal moves a piston in the master cylinder; brake fluid then applies great force to the brake pads or shoes
           subtype:  disk_brake__disc_brake  hydraulic brake in which friction is applied to both sides of spinning disk by the brake pads
           subtype:  drum_brake__drum_brakes  hydraulic brake in which friction is applied to the inside of a spinning drum by the brake shoe
           subtype:  foot_brake  hydraulic brake operated by pressing on a foot pedal
     subtype:  coaster_brake__coasterbrake  a brake on a bicycle that engages with reverse pressure on the pedals
     subtype:  hand_brake__emergency__emergency_brake__emergencybrake__parking_brake__parkingbrake  a brake operated by hand; usually operates by mechanical linkage
  subtype:  brake_pads  pads apply friction to both sides of the brake disk
  subtype:  brake_shoe__brakeshoe__shoe  restraint provided when the linings of the brake shoes are moved hydraulically against the brake drum to stop its rotation
  subtype:  catch.restraint__stop  a restraint that checks the motion of something; "he used a book as a stop to hold the door open"
     subtype:  doorstop__doorstopper  a stop that keeps open doors from moving
     subtype:  pawl__detent__click__dog  a hinged catch that fits into a notch of a ratchet to move a wheel forward or prevent it from moving backward
     subtype:  tripper  a catch mechanism that acts as a switch; "the pressure activates the tripper and releases the water"
  subtype:  chain.restraint  anything that acts as a restraint
  subtype:  holdfast__fastener__fastening  restraint that attaches to something or holds something in place
     subtype:  bellyband  a strap around the belly of a draft animal holding the shafts of a wagon
     subtype:  buckle  fastener that fastens together two ends of a belt or strap; often has loose prong
        subtype:  belt_buckle  the buckle used to fasten a belt
     subtype:  button  a round fastener sewn to shirts and coats etc to fit through buttonholes
        subtype:  coat_button  a button on a coat
        subtype:  shirt_button__shirtbutton  a button on a shirt
     subtype:  carabiner__karabiner__snap_ring  an oblong metal ring with a spring clip; used in mountaineering to attach a rope to a piton or to connect two ropes
     subtype:  catch.holdfast  a fastener that fastens or locks a door or window
        subtype:  hasp  a fastener for a door or lid; a hinged metal strap fits over a staple and is locked with a pin or padlock
        subtype:  hood_latch  a catch that holds the hood of a car shut
        subtype:  hook.catch  a catch for locking a door
        subtype:  latch  catch for fastening a door or gate; a bar that can be lowered or slid into a groove
     subtype:  clasp  a fastener (as a buckle or hook) that is used to hold two things together
     subtype:  cleat.holdfast  a fastener (usually with two projecting horns) around which a rope can be secured
     subtype:  clip.holdfast  any of various small fasteners used to hold loose articles together
        subtype:  bulldog_clip__bulldogclip__alligator_clip__alligatorclip  a clip with a spring that closes the metal jaws
        subtype:  hair_slide  (British) a decorative hinged clip that girls and women put in their hair to hold it in place
        subtype:  paperclip__gem_clip__gemclip  a wire or plastic clip for holding sheets of paper together
     subtype:  clothespin__clothes_pin__clothespin__clothes_peg__clothespeg  wood or plastic fastener; for holding clothes on a clothesline
     subtype:  corrugated_fastener__wiggle_nail  a small strip of corrugated steel with sharp points on one side; hammered across wood joints in rough carpentry
     subtype:  cotter__cottar  fastener consisting of a wedge or pin inserted through a slot to hold two other pieces together
        subtype:  cotter_pin  a cotter consisting of a split pin that is secured (after passing through a hole) by splitting the ends apart
     subtype:  cringle__loop__grommet  fastener consisting of a metal ring for lining a small hole to permit the attachment of cords or lines
     subtype:  dowel_pin__dowelpin__dowel__joggle  a fastener that is inserted into holes in two adjacent pieces and holds them together
     subtype:  fillet__stopping  fastener consisting of a narrow strip of welded metal used to join steel members
     subtype:  hook_and_eye  a kind of fastener used on clothing
     subtype:  knot  any of various fastenings formed by looping and tying a rope (or cord) upon itself or to another rope or to another object
        subtype:  barrel_knot__blood_knot__bloodknot  a knot used for tying fishing leaders together; the ends of the two leaders are wrapped around each other two or three times
        subtype:  bowknot__bow  a knot with two loops and loose ends; used to tie shoelaces
        subtype:  carrick_bend__carrickbend  a knot used to connect the ends of two large ropes or hawsers
        subtype:  clove_hitch__clovehitch  a knot used to fasten a line temporarily to a post or spar
        subtype:  figure_of_eight__figure_eight  a knot having the shape of the numeral 8; tied in a rope that has been passed through a hole or pulley and that prevents the rope from coming loose
        subtype:  fisherman's_bend__fisherman'sbend  a knot for tying a line to a spar or ring
        subtype:  fisherman's_knot__fisherman'sknot__true_lover's_knot__truelove_knot  a knot for tying the ends of two lines together
        subtype:  Gordian_knot  an intricate knot tied by King Gordius of Phrygia and cut with his sword by Alexander the Great after hearing that whoever undid it would become ruler of Asia
        subtype:  half_hitch  a knot used to fasten a rope temporarily to an object; usually tied double
        subtype:  hawser_bend  a knot uniting the ends of two lines
        subtype:  hitch  a knot that can be undone by pulling against the strain that holds it
           subtype:  Blackwall_hitch  a simple hitch used for temporarily attaching a line to a hook
           subtype:  cat's-paw__cat'spaw  a hitch in the middle of rope that has two eyes into which tackle can be hooked
           subtype:  rolling_hitch__rollinghitch  a hitch for fastening a line to a spar or another rope
              subtype:  magnus_hitch  a rolling hitch similar to a clove hitch
           subtype:  sheet_bend__sheetbend__becket_bend__weaver's_knot__weaver's_hitch  a hitch used for temporarily tying a rope to the middle of another rope (or to an eye)
           subtype:  timber_hitch  a hitch used to secure a rope to a log or spar; often supplemented by a half hitch
        subtype:  loop_knot  any of various knots used to make a fixed loop in a rope
           subtype:  bowline_knot__bowlineknot__bowline  a loop knot that neither slips not jams
        subtype:  love_knot__lover's_knot__lover'sknot  a stylized knot used as an emblem of love
        subtype:  overhand_knot  a simple small knot (often used as part of other knots)
        subtype:  prolonge_knot__sailor's_breastplate  a knot in the rope used to drag a gun carriage
        subtype:  sheepshank  a knot for shortening a line
        subtype:  slipknot  a knot at the end of a cord or rope that can slip along the cord or rope around which it is made
        subtype:  square_knot  a double knot made of two half hitches and used to join the ends of two cords
           subtype:  reef_knot__flat_knot  a square knot used in a reef line
              subtype:  granny_knot__granny  a reef knot crossed the wrong way and therefore insecure
        subtype:  stopper_knot__stopperknot  a knot that prevents a rope from passing through a hole
           subtype:  Matthew_Walker_knot__Matthew_Walker  a kind of stopper knot
        subtype:  surgeon's_knot__surgeon'sknot  any of several knots used in tying stitches or ligatures
        subtype:  Turk's_head  an ornamental knot that resembles a small turban
        subtype:  Windsor_knot  a wide triangular knot for tying a tie
     subtype:  lashing  rope that is used for fastening something to something else; "the boats were held together by lashings"
     subtype:  linkup__link__tie__tie-in__tiein  a fastener that serves to join or link; "the walls are held together with metal links placed in the wet mortar during construction"
        subtype:  bridge.linkup__nosepiece  the link between two lenses; rests on nose
     subtype:  lock.holdfast  a fastener fitted to a door or drawer to keep it firmly closed
        subtype:  combination_lock__combinationlock  lock that can be opened only by turning dials in a special sequence
        subtype:  cylinder_lock  a lock in which a cylinder rotates to move bolt; tumblers are pins; inserting the key lifts and aligns the pins to free the cylinder to rotate
        subtype:  doorlock  a lock on an exterior door
           subtype:  night_latch__nightlatch  doorlock operated by a knob on the inside and a key on the outside
        subtype:  door_latch__latch  spring-loaded doorlock that can only be opened from the outside with a key
        subtype:  lever_lock__leverlock  a lock whose tumblers are levers that must be raised to a given position so that the bolt can move
        subtype:  padlock  a detachable lock; has a hinged shackle that can be passed through the staple of a hasp or the links in a chain and then snapped shut
        subtype:  sash_fastener__sash_lock__window_lock  a lock attached to the sashes of a double hung window that can fix both in the shut position
     subtype:  locker  a fastener that locks or closes
     subtype:  nail  a thin pointed piece of metal that is hammered into materials as a fastener
        subtype:  brad  a small nail
        subtype:  clout_nail__cloutnail__clout  a short nail with a flat head; used to attach sheet metal to wood
        subtype:  doornail  a nail with a large head; formerly used to decorate doors
        subtype:  eightpenny_nail  a nail 2.5 inches long
        subtype:  fourpenny_nail__fourpennynail  a nail 1.5 inches long
        subtype:  hobnail  a short nail with a thick head; used to protect the soles of boots
        subtype:  sixpenny_nail  a nail 2 inches long
        subtype:  spike.nail  a long metal nail
        subtype:  staple.nail  a short U-shaped wire nail for securing cables
        subtype:  stub_nail  a short thick nail
        subtype:  tack.nail  a short nail with a sharp point and a large head
           subtype:  carpet_tack  used to nail down carpets
           subtype:  thumbtack__drawing_pin__drawingpin__pushpin  a tack for attaching papers to a bulletin board or drawing board
           subtype:  tintack  tack or small nail of tinned iron
        subtype:  tenpenny_nail  a nail 3 inches long
     subtype:  nut_and_bolt__nutandbolt  a fastener made by screwing a nut onto a threaded bolt
     subtype:  paper_fastener__paperfastener  a fastener for holding a sheet of paper in place
        subtype:  staple  paper fastener consisting of a short length of U-shaped wire that can fasten papers together
        subtype:  thumbtack__drawing_pin__drawingpin__pushpin  a tack for attaching papers to a bulletin board or drawing board
     subtype:  pin  a small slender (often pointed) piece of wood or metal used to support or fasten or attach things
        subtype:  barrette  a pin for holding women's hair in place
        subtype:  bitt_pin  a pin through the bitthead to keep the mooring lines from slipping off
        subtype:  hairpin  a double pronged pin used to hold women's hair in place
           subtype:  bobby_pin__bobbypin__hairgrip__grip  a flat wire hairpin whose prongs press tightly together; used to hold bobbed hair in place; "in England they call a bobby pin a grip"
           subtype:  bodkin.hairpin  formerly a long hairpin; usually with an ornamental head
        subtype:  hatpin  a long sturdy pin used by women to secure a hat to their hair
        subtype:  linchpin__lynchpin  pin inserted through an axletree to hold a wheel on
        subtype:  peg.pin  a wooden pin pushed or driven into a surface
           subtype:  golf_tee__tee  a short peg put into the ground to hold a golf ball off the ground
           subtype:  tent_peg  a peg driven into the ground to hold a rope supporting a tent
           subtype:  treenail__trenail__trunnel  a wooden peg that is used to fasten timbers in shipbuilding; water causes the peg to swell and hold the timbers fast
        subtype:  rivet  heavy pin having a head at one end and the other end being hammered flat after being passed through holes in the pieces that are fastened together
        subtype:  safety_pin  a pin in the form of a clasp; has a guard so the point of the pin will not stick the user
        subtype:  skewer  a long pin for holding meat in position while it is being roasted
           subtype:  spit  a skewer for holding meat over a fire
              subtype:  turnspit  a roasting spit that can be turned
        subtype:  straight_pin  pin consisting of a short straight stiff piece of wire with a pointed end; used to fasten pieces of cloth or paper together
        subtype:  toggle  a wooden peg or pin inserted into the eye at the end of rope in order to fasten it to something
        subtype:  wrist_pin__wristpin__gudgeon_pin__gudgeonpin  pin joining a piston to a connecting rod
     subtype:  screw  a fastener with a tapered threaded shank and a slotted head
        subtype:  Allen_screw  a screw with a hexagonal hole in the head
        subtype:  bolt.screw  a screw that screws into a nut to form a fastener
           subtype:  carriage_bolt  a round-headed bolt for timber; threaded along part of the shank; inserted into holes already drilled
           subtype:  expansion_bolt__expansionbolt  a bolt that has an attachment that expands as the bolt is driven into a surface
           subtype:  kingbolt__kingpin__swivel_pin  bolt that provides a steering joint in a motor vehicle
           subtype:  machine_bolt__machinebolt  a bolt with a square or hexagonal head on one end and a threaded shaft on the other end; tightened with a wrench; used to connect metal parts
           subtype:  stove_bolt__stovebolt  a small machine bolt
        subtype:  cap_screw__capscrew  a threaded screw for machine parts; screws into a tapped hole
        subtype:  machine_screw__machinescrew  a screw used either with a nut or with a tapped hole; slotted head can be driven by a screwdriver
        subtype:  metal_screw__metalscrew  screw made of metal
        subtype:  Phillips_screw  (trademark) a screw with a special head having crossed slots
        subtype:  thumbscrew  screw designed to be turned with the thumb and fingers
        subtype:  woodscrew  a metal screw that tapers to a point so that it can be driven into wood with a screwdriver
           subtype:  lag_screw__lagscrew__lag_bolt__lagbolt  a heavy woodscrew with a square or hexagonal head that is driven in with a wrench
           subtype:  screw_eye__screweye  a woodscrew having its shank bent into a ring
        subtype:  worm.screw  screw thread on a gear with the teeth of a worm wheel or rack
     subtype:  seal.holdfast  fastener that provides a tight and perfect closure
        subtype:  break_seal__breakseal  a seal that must be broken when first used and cannot easily be resealed; "it was stored in a tube with a break seal"
        subtype:  gasket  seal consisting of a ring for packing pistons or sealing a pipe joint
           subtype:  head_gasket  a gasket to seal a cylinder head
           subtype:  O_ring  a gasket consisting of a flat ring of rubber or plastic; used to seal a joint against high pressure
        subtype:  piston_ring  seal consisting of a split metal ring that seals the gap between a piston and the cylinder wall
        subtype:  washer  seal consisting of a flat disk placed to prevent leakage
           subtype:  lockring__lock_washer  washer that prevents a nut from loosening
     subtype:  sealing_wax__sealingwax__seal  fastener consisting of a resinous composition that is plastic when warm; used for sealing documents and parcels and letters
     subtype:  slide_fastener__slidefastener__zip__zip-fastener__zipfastener  a fastener for locking together two toothed edges by means of a sliding tab
     subtype:  snap_fastener__press_stud__pressstud  a fastener used on clothing
  subtype:  gag__muzzle  restraint put into a person's mouth to prevent speaking or shouting
  subtype:  leash__tether__lead  restraint consisting of a rope (or light chain) used to restrain an animal
  subtype:  ignition_lock__lock  a restraint incorporated into the ignition switch to prevent the use of a vehicle by persons who do not have the key
  subtype:  safety_belt__life_belt__safety_harness  belt attaching you to some object as a restraint in order to prevent you from getting hurt
     subtype:  seat_belt  a safety belt used in a car or plane to hold you in your seat in case of an accident
  subtype:  sea_anchor__seaanchor__drogue  restraint consisting of a canvas covered frame that floats behind a vessel; prevents drifting or maintains the heading into a wind
  subtype:  trammels__shackle__hamper  a restraint that confines or restricts freedom (especially something used to tie down or restrain a prisoner)
     subtype:  ball_and_chain  heavy iron ball attached to a prisoner by a chain
     subtype:  fetter__hobble  a shackle for the ankles or feet
        subtype:  trammel  a fetter that is used to teach a horse to amble
     subtype:  handcuffs__handcuff__handcuff__cuffs__cuff__cuff__handlock__manacle  shackle that consists of a metal loop that can be locked around the wrist; usually used in pairs
     subtype:  irons__iron__iron__chain__chains  metal shackles; for hands or legs

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