To increase the speed of an engine by pushing the accelerator, or to excite or energize someone.
Short for 'revolution,' referring to the revolutions per minute (RPM) of an engine, becoming a verb in 20th-century automotive language.
Car engines literally 'revolve'—the pistons go up and down, the crankshaft spins, so 'rev' is measuring those rotations per minute, and when you 'rev' an engine, you're speeding up those revolutions.
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