Crossword Genius

Blow up and down (4)

Ross

I believe the answer is:

toot

This clue is a double definition.

'blow' is the first definition.
(I've seen this before)

'up and down' is the second definition.

(Other definitions for toot that I've seen before include "Sound one's horn" , "Brief blast on a horn" , "Parp" , "Horn's sound (T, not H)" , "Noise made by car horn" .)

I've seen this clue in The Globe and Mail.
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