#lock.holdfast  a fastener fitted to a door or drawer to keep it firmly closed
  supertype:  #holdfast__fastener__fastening  restraint that attaches to something or holds something in place
  part:  #deadbolt  #keyhole  #tumbler.obstructor
  part of:  #door  #drawer  #gate  #lid
  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

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