Crossword Genius

Sharp or tart (4)

Ross

I believe the answer is:

acid

I believe this is a double definition.

'sharp' is the first definition.
(as in sharp-tasting)

'tart' is the second definition.
(both can mean bitter-tasting)

(Other definitions for acid that I've seen before include "Polluted precipitation" , "Sour - sharp" , "Sour to the taste" , "See 4 Across" , "Type of chemical" .)

I've seen this clue in the Penny Press.
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