Crossword Genius

Locomotive sound (4)

Ross

I believe the answer is:

chug

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

This is all the clue.

(Other definitions for chug that I've seen before include "Noise of a slow engine" , "Dull noise made by an engine" , "drink" .)

I've seen this clue in the Newsday.com, the Newsday and the L.A. Times Sunday.
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