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lost motion

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noun Machinery.
  1. motion of a machine or mechanism, especially a reciprocating one, during which no useful work is performed.
  2. motion between parts in an assembly due to manufacturing tolerances, adjustments, slip, or wear.
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Origin of lost motion

First recorded in 1875–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018