nullify

Synonyms: abate abolish abrogate annihilate annul ax blue pencil bring to naught call all bets off compensate confine counteract counterbalance countervail disannul forget it invalidate kill limit negate neutralize nig offset quash render null and void renege renig repeal rescind restrict scratch scrub squash stamp out take out torpedo trash undo veto vitiate void wash out wipe out zap

Antonyms: affirm pass sanctify validate