rev
rev [rev revs revved revving] verb, noun BrE [rev] NAmE [rev]
verb (-vv-)transitive, intransitive ~ (sth) (up)
when you rev an engine or it revs, it runs quickly
•The taxi driver revved up his engine.
•I could hear the car revving outside.
Verb forms: 
Word Origin:
early 20th cent.: abbreviation of ↑revolution.
noun (informal)
a complete turn of an engine, used when talking about an engine's speed
Syn: ↑revolution
•4 000 revs per minute
•The needle on the rev counter soared. 
Word Origin:
early 20th cent.: abbreviation of ↑revolution.
Example Bank:
•The engine is almost silent at low revs.
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