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English definition of “rev”

rev

noun [C usually plural] uk   /rev/ informal us  
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

rev

verb [I or T] uk   /rev/ (-vv-) us  
to increase the operating speed of an engine while the vehicle is not moving, usually to warm it to the correct temperature: The noise of the car engine revving up woke the whole neighbourhood.
Phrasal verbs
(Definition of rev noun, verb from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of rev?
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