Crossword Genius

Fires up, as an engine (4)

Ross

I believe the answer is:

revs

'fires up as an engine' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for revs that I've seen before include "Rotations of a motor, in short" , "Units of engine speed (abbr)" .)

I've seen this clue in the LA Times, the King Feature Syndicate and The Wall Street Journal.
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