unfasten, untie, or loosen (something)
解开;打开;松开
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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
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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。
〈正式〉 使垮台;毁灭
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Iago's hatred of women undoes him .埃戈对女性的仇恨毁了他自己。
【计算机】 撤消还原。
"Old English