Crossword Genius

Machinery sound (4)

Ross

I believe the answer is:

whir

'machinery sound' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for whir that I've seen before include "Prolonged buzz" , "Spin with a humming sound" , "Make a humming noise" , "Rotate with hum" , "Soft swishing sound" .)

I've seen this clue in The Wall Street Journal.
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