undo (undoes; past undid; past participle undone) [with obj.]
unfasten, untie, or loosen (something) 解开;打开 the knot was difficult to undo. 这个结很难解。
cancel or reverse the effects or results of (a previous action or measure) 消除…影响或结果;使恢复原状 there wasn't any way Evelyn could undo the damage. 伊芙琳根本无法消除那损害所造成的影响。 ■cancel (the last command executed by a computer) 取消(计算机上一个执行的命令);恢复
(formal)cause the downfall or ruin of (正式)使垮台;毁灭 Iago's hatred of women undoes him. 埃戈对女性的仇恨毁了他自己。
noun
(Computing)a feature of a computer program that allows a user to cancel or reverse the last command executed (计算机)撤消还原