revoke

Synonyms: abjure abolish abrogate annul back out of backpedal call back call off countermand counterorder declare null and void deny disclaim dismantle dismiss disown erase expunge forswear invalidate lift negate nix nullify obliterate quash recall recant remove renounce repeal repudiate rescind retract reverse rub out scrub set aside vacate void wipe out withdraw

Antonyms: approve authorize enforce