Also found in: Thesaurus.
Related to ratch: scratch
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|Noun||1.||ratch - mechanical device consisting of a toothed wheel or rack engaged with a pawl that permits it to move in only one direction|
mechanical device - mechanism consisting of a device that works on mechanical principles
detent, pawl, click, dog - a hinged catch that fits into a notch of a ratchet to move a wheel forward or prevent it from moving backward
ratchet wheel - toothed wheel held in place by a pawl or detent and turned by a lever