From The Collaborative International Dictionary of English v.0.44 [gcide]:
1. (Mech.) The distance through which one part of connected machinery, as a wheel, piston, or screw, can be moved without moving the connected parts, resulting from looseness in fitting or from wear; also, the jarring or reflex motion caused in badly fitting machinery by irregularities in velocity or a reverse of motion.
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
61 Moby Thesaurus words for "backlash": antagonism, antipathy, backfire, backlashing, backwash, boomerang, bounce, bounce back, bound, carom, clashing, clout, collision, conflict, confutation, contradiction, contraposition, contrariety, contrecoup, counteraction, counterposition, counterworking, crankiness, crotchetiness, dissent, force, friction, impact, impress, impression, imprint, interference, kick, kick back, kickback, mark, nonconformity, opposition, opposure, oppugnance, oppugnancy, perverseness, print, reaction, rebound, rebuff, recalcitrance, recalcitration, recoil, reflex, renitency, repercussion, repugnance, repulse, resilience, resistance, response, revolt, ricochet, spring, swimming upstream
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