#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
  subtype:  #combination_lock  #cylinder_lock  #doorlock  #door_latch  #lever_lock  #padlock  #sash_fastener
  part of:  #door  #drawer  #gate  #lid
  part:  #deadbolt__bolt  the part of a lock that is engaged or withdrawn with a key
  part:  #keyhole  the hole where a key is inserted
  part:  #tumbler.obstructor  a movable obstruction in a lock that must be adjusted to a given position (as by a key) before the bolt can be thrown

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