Water cooler sound (4)

I think it could be either:

Which length description are you looking for?:

glug

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

This is the entire clue.

(Other definitions for glug that I've seen before include "Drink" , "Hollow gurgling sound" , "Noise of emptying bottle" .)

I've seen this clue in the LA Times and the Newsday.

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