n. & v.
--n.
1. a set of teeth on the edge of a bar or wheel in which a device engages to ensure motion in one direction only.
2 (in full ratchet-wheel) a wheel with a rim so toothed.
--v. (ratcheted, ratcheting)
1. tr. a provide with a ratchet. b make into a ratchet.
2 tr. & intr. move as under the control of a ratchet.
Etymology: F rochet blunt lance-head, bobbin, ratchet, etc., prob. ult. f. Gmc