pawl

Noun
  1. A hinged catch that fits into a notch of a ratchet to move a wheel forward or prevent it from moving backward (synset 103907626)
    is a type of: catch, stop - a restraint that checks the motion of something
    is a part of: rachet, ratch, ratchet - mechanical device consisting of a toothed wheel or rack engaged with a pawl that permits it to move in only one direction
    same as: click, detent, dog

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