Etymology
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rev (v.)

"cause (an engine) to run quickly," especially when not in gear, 1916, from earlier noun (1901), shortening of revolution, in reference to the internal combustion engine. Related: Revved; revving.

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Definitions of rev
1
rev (v.)
increase the number of rotations per minute;
rev up an engine
Synonyms: rev up
2
rev (n.)
rate of revolution of a motor;
the engine was doing 6000 revs
Synonyms: revolutions per minute / rpm
From wordnet.princeton.edu