• (mechanics) 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.
  • A reaction, objection or outcry, especially of a violent or abrupt nature.

    "The public backlash to the proposal was quick and insistent."

  • A sudden backward motion.
  • The jarring or reflex motion caused in badly fitting machinery by irregularities in velocity or a reverse of motion.


  • To cause or set off a backlash.

    "(The addition of quotations indicative of this usage is being sought):"

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