revving up

rev

[rev] Informal.
noun
1.
a revolution (in an engine or the like).
verb (used with object), revved, revving.
2.
to accelerate sharply the speed of (an engine or the like) (often followed by up ).
verb (used without object), revved, revving.
3.
(of an engine) to accelerate; become revved (often followed by up ).
Verb phrases
4.
rev up, to increase in strength or accelerate sharply: The economy is beginning to rev up.

Origin:
1900–05; short for revolution

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rev (rɛv)
 
n
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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Etymonline
Word Origin & History

rev
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
Rev
Reverend
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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