1. [ verb ] move by degrees in one direction only, as of toothed wheels
Synonyms: ratchet_down rachet_up
Related terms: advance
2. [ noun ] mechanical device consisting of a toothed wheel or rack engaged with a pawl that permits it to move in only one direction
Synonyms: ratch rachet
Related terms: mechanical_device spiral_ratchet_screwdriver ratchet_wheel pawl