undo

verb

1. 打开；解开；拆开
   to open sth that is fastened, tied or wrapped
   1. to undo a button/knot/zip, etc.
      解开纽扣、解开绳结、拉开拉锁等
   2. to undo a jacket/shirt, etc.
      解开上衣、衬衫等
   3. I undid the package and took out the books.
      我打开包裹取出书来。
2. 消除，取消，废止（某事的影响）
   to cancel the effect of sth
   1. He undid most of the good work of the previous manager.
      他把前任经理的大部分功绩都毁掉了。
   2. It's not too late to try and undo some of the damage .
      想办法补救部分损失还为时不晚。
   3. UNDO (= a command on a computer that cancels the previous action)
      撤销（计算机的还原指令）
3. 打败；挫败
   to make sb/sth fail
   1. The team was undone by the speed and strength of their opponents.
      这个队被对手的速度和体力打败了。

1. VERB 解开；松开；打开
   If you undo something that is closed, tied, or held together, or if you undo the thing holding it, you loosen or remove the thing holding it.
   1. I managed secretly to undo a corner of the parcel...
      我悄悄地设法解开了包裹的一角。
   2. I undid the bottom two buttons of my yellow and grey shirt...
      我解开了自己黄灰相间的衬衫上最下面的两个纽扣。
   3. Some clamps that had held the device together came undone.
      用来将装置夹在一起的一些夹子松开了。
2. VERB 撤销；抵消；消除
   To undo something that has been done means to reverse its effect.
   1. A heavy-handed approach from the police could undo that good impression...
      警方采取高压手段可能会毁掉之前留下的好印象。
   2. She knew it would be difficult to undo the damage that had been done...
      她知道想要消除已经造成的损害是很难的。
   3. If Michael won, he would undo everything I have fought for.
      如果迈克尔赢了，那我一直以来努力争取的一切都将白费。
3. VERB 破坏；毁掉
   If a person, organization, or plan is undone by something, that thing causes their failure.
   1. They were undone by a goal from John Barnes...
      约翰·巴恩斯的一粒进球使他们落败。
   2. Macbeth is the story of a Scottish soldier who becomes king but is undone by his own ambition.
      《麦克白》讲述的是一个苏格兰士兵当上了国王，却毁于自己的野心。
4. See also: undoing undone

1. Once the damage is done, even modern surgery can't undo it entirely.
   伤害一旦造成，即使是现代外科手术也无法将其完全消除。
2. If you want to repair the wheels you just undo the four nuts.
   如果你想修理轮子，只需拧开这4个螺母就行了。
3. I managed secretly to undo a corner of the parcel
   我悄悄地设法解开了包裹的一角。
4. I undid the bottom two buttons of my yellow and grey shirt
   我解开了自己黄灰相间的衬衫上最下面的两个纽扣。
5. Some clamps that had held the device together came undone.
   用来将装置夹在一起的一些夹子松开了。
6. A heavy-handed approach from the police could undo that good impression
   警方采取高压手段可能会毁掉之前留下的好印象。
7. She knew it would be difficult to undo the damage that had been done
   她知道想要消除已经造成的损害是很难的。
8. If Michael won, he would undo everything I have fought for.
   如果迈克尔赢了，那我一直以来努力争取的一切都将白费。
9. They were undone by a goal from John Barnes
   约翰·巴恩斯的一粒进球使他们落败。
10. Macbeth is the story of a Scottish soldier who becomes king but is undone by his own ambition.
    《麦克白》讲述的是一个苏格兰士兵当上了国王，却毁于自己的野心。
11. The thread is so tangled. I simply can't undo it.
    线乱成了一团，怎么也择不开了。
12. You can undo the applied filter from the context menu or from the drop-down menu.
    您可以从内容菜单或者下拉菜单中取消应用的过滤器。
13. During the course of editing, undo, and redo, the model is the only thing that endures.
    在编辑、撤销和重做的过程中，模型是唯一保持不变的。
14. Database-2 writes Undo and Do records and state to its recovery log, again just as Database-1 did.
    Database-2把Undo和Do记录及状态写入它的恢复日志，再次像Database-1做的一样。
15. You can only undo a single transaction.
    只能撤消一个事务。
16. With this symbol, I undo it all, and make it as it had never been!
    我取下这个标志，也就同时取下了与此相关的一切，就象从来没发生过这件事一样！
17. There is no "undo" or "undelete" in your database.
    你的数据库中不能“取消”或者“恢复被删除的文件”。
18. Use key'BACKSPACE'for an UNDO mode, and'ESC'to end the game.
    使用关键的'退格'一个撤消模式，和'ESC的结束比赛。
19. Property or else that change will not be tracked by undo.
    属性，否则撤消将不会跟踪这一更改。
20. Choose undo from the edit menu.
    从“编辑”菜单中选择“撤消”。
21. You cannot undo or redo a folder action while the folder is loading.
    在装入文件夹期间无法复原或重做一个文件夹操作。
22. In access, the undo and redo options allow you to undo or redo one or several changes at once.
    在access中，“撤消”和“恢复”选项允许您一次撤消或恢复一个或多个更改。
23. If the database was shut down regularly, recovery skips the redo and undo phases.
    如果数据库定期关闭，恢复将跳过重做和撤消两个阶段。
24. When used as comparison functions, Undo and Redo are really one function and not two.
    在使用比较功能时，撤销和恢复实际上是一个功能，而不是两个。
25. And now I have to undo it all.
    而现在我要把它们都取消。
26. The undo command change to can not undo on the menu if you cannot reverse your last action.
    如果不能退回最后一个操作，撤消命令会变化到菜单上的不能撤消命令。
27. If I could undo what I did, I would.
    如果我改变过去，我会的。
28. He is choking, undo him.
    他快窒息了，把他的衣服解开。
29. An undo or redo operation has occurred and the DOM is read-only.
    发生了撤消或恢复操作，并且dom为只读。
30. Use Ctrl-Z or undo on the edit menu to undo your changes.
    使用ctrl-z或“编辑”菜单中的“撤消”来撤消所做的更改。

verb

1. remove the outer cover or wrapping of
   1. Let's unwrap the gifts!
   2. undo the parcel

   Synonym:    unwrap

2. cause to become loose
   1. undo the shoelace
   2. untie the knot
   3. loosen the necktie

   Synonym:    untieloosen

3. cancel, annul, or reverse an action or its effect
   1. I wish I could undo my actions

4. deprive of certain characteristics

   Synonym:    unmake

5. cause the ruin or downfall of
   1. A single mistake undid the President and he had to resign