Crossword Genius

Sound of a revving engine (5)

Ross

I believe the answer is:

vroom

(Other definitions for vroom that I've seen before include "Sound of an engine revving" , "Sound of a car speeding away" , "roar away" , "(Of engine) make roaring sound (colloq.)" , "loud engine noise" .)

I've seen this clue in The Guardian and The Telegraph.
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