Here you will find one or more explanations in English for the word Backlash.
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Backlash
Backlash Back"lash`, n. [Back, adv. + lash.] (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.
Meaning of Backlash from wikipedia