noun A suddenly reversed or backward motion, such as of a rope or elastic band when it snaps under tension.
noun A negative reaction, objection or outcry, especially of a violent or abrupt nature.
The public backlash to the proposal was quick and insistent.
noun The looseness through which one part of connected machinery, such as a wheel, gear, piston, or screw, can be moved without moving the connected parts, or a measurement of the distance moved thereby; either intentional (as allowance) or unintentional (from error or wear).Wagon wheel structure showing felk
noun The jarring or reflex motion caused in badly fitting machinery by irregularities in velocity or a reverse of motion.
verb To perform a backlash, to lash back in reaction to some cause.