(n.) 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.

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