#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
  supertype:  #catch.restraint__stop  a restraint that checks the motion of something; "he used a book as a stop to hold the door open"
  part of:  #ratchet__rachet__ratch  mechanical device consisting of a toothed wheel or rack engaged with a pawl that permits it to move in only one direction
     part of:  #spiral_ratchet_screwdriver__ratchet_screwdriver__ratchetscrewdriver  a screwdriver with a ratchet (so the blade turns in only one direction) and a spiral in the handle (so the blade rotates) with downward pressure on the handle

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