[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
Their hormone levels were revved up and did not slide off as the day progressed.
Application of the makeup may have revved up cells' immunity and protected
  against infection.
The major oil dependent economies have a foot placed firmly on a pedal that has
  been locked and frozen into a revved position.
Diving the nose down and then pulling it up, he really revved the engines.
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