undo

Synonyms: disengage disentangle free loose loosen release unbind unblock unbutton unclose unfasten unfix unlock unloose unloosen unravel unshut unstop untie unwrap

Antonyms: close do fasten

Synonyms: abate abolish abrogate annihilate annul break bring down bring to naught cancel cramp craze crimp decimate defeat demolish destroy have impoverish injure make waves mar negate neutralize offset outfox outmaneuver outsmart overreach overthrow overturn quash queer raze reverse ruin screw up shatter skin smash spoil stymie subvert unbuild undermine unsettle upset vitiate wipe out wrack wreck

Antonyms: approve permit validate