vt. (-did; -done ) 1.使恢复原状，使复旧；取消，废除。 2.脱去，拆去，解开，打开，放松。 3.〔古语〕解释，说明，解(谜等)。 4.破坏；毁灭；糟蹋；败坏；使落魄，使破落。 5.勾引，诱奸。 短语和例子 What's done cannot be undone. 覆水难收。 It is better for the doer to undo what he has done. 解铃还需系铃人。 undo a match 解除婚约。 undo a parcel 打开包裹。 undo a knot 解开结子。
remove the outer cover or wrapping of; "Let''s unwrap the gifts!"; "undo the parcel" 同义词：unwrap,
cause to become loose; "undo the shoelace"; "untie the knot"; "loosen the necktie" 同义词：untie, loosen,
cancel, annul, or reverse an action or its effect; "I wish I could undo my actions"
deprive of certain characteristics 同义词：unmake,
cause the ruin or downfall of; "A single mistake undid the President and he had to resign"
Undo is a command in many computer programs. It erases the last change done to the document reverting it to an older state.
例句与用法
1.
I wonderdid he leave thing undone ? 我在想他有没有没做完的事？
2.
Lotte lippman's hair had come undone . 洛蒂李普曼的头发已经蓬乱了。
3.
It is better for the doer to undo what he has done . 解铃还需系铃人。
4.
It might mean undoing years of work . 这可能意味着多年的工作前功尽弃。
5.
This proved to be his undoing . 这种情况后来成了他垮台的原因。
6.
"we are both undone if it comes out. " “假使这事泄漏出来，我俩就都毁了。”
7.
First undo the buttons and take off the shirt ! 首先解开钮扣，然后脱掉衬衣！
8.
It was that comparison which was her undoing . 没想到这一比较给她播下了祸种。
9.
Ah, don't let us undo what you've done . 啊，不要让我们改变你们已经决定了的事。
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