Crossword Genius

Vinegary or vituperative (4)

Ross

I believe the answer is:

acid

I believe this is a double definition.

'vinegary' is the first definition.
(I've seen this in another clue)

'vituperative' is the second definition.
(thesaurus)

(Other definitions for acid that I've seen before include "Bitter substance" , "Corrosive fluid" , "Battery fluid" , "Sour tasting" , "Sour to the taste" .)

I've seen this clue in the Newsday.
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