motion of a machine or mechanism, especially a reciprocating one, during which no useful work is performed.
motion between parts in an assembly due to manufacturing tolerances, adjustments, slip, or wear.
- Lost on one
Have no effect or influence on one, as in Ned’s attempts at humor were lost on Meg, or David’s kindness was not lost on his aunt. This expression uses lost in the sense of “wasted.” [ c. 1600 ] Also see: you’ve lost me
noun 1. See under (def 1).
noun, Chiefly British. 1. .
noun 1. a river that flows into an underground passage or sinkhole.