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backlash noun

  /ˈbækˌlæʃ/
  • (figurative) A negative reaction, objection or outcry, especially of a violent or abrupt nature.
  • (mechanics) 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
 バックラッシュ
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