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English definition of “rev”

rev

noun [C usually plural]     /rev/ informal
a revolution (= one complete turn of a part in an engine ): Keep the revs up (= the engine parts turning quickly ) or the engine will stall . a rev counter → See also rpmRevolving, rotating and spinningThe engine and engine partsEngines and motors
(Definition of rev noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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