abate abrogate annihilate annul blot out bring to naught cancel countermand counterorder delete demolish deracinate destroy disallow disannul do away with eliminate end eradicate erase expunge exterminate extinguish extirpate invalidate liquidate make void negate negative nullify obliterate override overrule quash recall recant renege repeal rescind retract reverse revoke root out set aside stamp out suspend terminate undo uproot vacate vitiate void waive wipe out withdraw write off