WordReference Random House Learner's Dictionary of American English © 2015
rev /rɛv/USA pronunciation n., v., revved, rev•ving.[Informal.]

n. [countable]
  • Informal Termsa revolution of the crankshaft within an engine.

  • v. 
  • Informal Termsto (cause to) go faster sharply, such as a car, etc.: [+ object ( + up)]He revved the race car (up).[~ ( + up) + object]The racers revved (up) their engines.[no object; ~ + up]The two cars revved up at the traffic light.
  • [no object;
    + up]
    to increase in activity or speed:The economy began to rev up.

  • Collins Concise English Dictionary © HarperCollins Publishers::

    rev /rɛv/ informal n
    1. revolution per minute
    vb (revs, revving, revved)
    1. (often followed by up) to increase the speed of revolution of (an engine)

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