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lost motion

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.
Origin
1875-1880
1875-80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for lost motion
  • Most of lost motion occurs before arm can cause socket to function usefully.

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