Словарь синонимов английского языка - undo

(v) 1. loosen, loose, open, unfasten, unhook, unlace, unzip, unsnap, unbutton, untie, unpin; unlock, unbolt: Help me undo my blouse. Don't undo the gate you'll let the dogs out. 2. unwrap, uncover, open, untie, unbind: Why have you allowed the children to undo their Christmas presents a week early? 3. cancel, annul, rescind, nullify, void, declare null and void, reverse, invalidate: If one could undo things there would be no such thing as regret.