#catch.restraint__stop  a restraint that checks the motion of something; "he used a book as a stop to hold the door open"
  supertype:  restraint.device__constraint  a device that stops something from moving; "the car did not have proper restraints fitted"
  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"

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