Crossword Genius

Train whistle sound (4)

Ross

I believe the answer is:

toot

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

This is all the clue.

(Other definitions for toot that I've seen before include "Do it on a flute" , "Sound one's horn" , "Parp" , "Short sound of horn" , "Use horn" .)

I've seen this clue in the Universal and the USA Today.
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