[rev] Informal.
a revolution (in an engine or the like).
verb (used with object), revved, revving.
to accelerate sharply the speed of (an engine or the like) (often followed by up ).
verb (used without object), revved, revving.
(of an engine) to accelerate; become revved (often followed by up ).
Verb phrases
rev up, to increase in strength or accelerate sharply: The economy is beginning to rev up.

1900–05; short for revolution Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rev (rɛv)
1.  revolution per minute: the engine was doing 5000 revs
vb , revs, revving, revved
2.  (often foll by up) to increase the speed of revolution of (an engine)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1916, from earlier noun (1901), shortening of revolution, in reference to the internal combustion engine.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
But instead of the constantly revving engines of a speed race, the noise from
  the track was intermittent.
She puffed furiously in quick spurts, a little engine revving.
Always conduct basic checks of an engine before revving up.
The best way to do this is by easing into your drive and avoiding excessive
  engine revving.
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