Crossword Genius

Acid's opposite (4)

Ross

I believe the answer is:

base

'acid's opposite' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for base that I've seen before include "Low kind of foundation" , "Shameful - headquarters" , "Ignoble - HQ" , "Foundation; counterfeit" , "Ignoble - foundation" .)

I've seen this clue in the USA Today.
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