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TOEFL IELTS BNC: 6417 COCA: 6632
undo
ʌnduː ʌnˈduː ʌnˈdu
Word forms: 3rd person singular present tense undoes, present participle undoing, past tense undid, past participle undone
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. 解开；松开；打开

  • I managed secretly to undo a corner of the parcel. [VERB noun]

    我悄悄地设法解开了包裹的一角。

  • I undid the bottom two buttons of my yellow and grey shirt. [VERB noun]

    我解开了自己黄灰相间的衬衫上最下面的两个纽扣。

  • Some clamps that had held the device together came undone. [VERB-ed]

    用来将装置夹在一起的一些夹子松开了。

SYN open, unfasten, loose, loosen
2 VERB 撤销；抵消；消除 To undo something that has been done means to reverse its effect. 撤销；抵消；消除

  • A heavy-handed approach from the police could undo that good impression. [VERB noun]

    警方采取高压手段可能会毁掉之前留下的好印象。

  • She knew it would be difficult to undo the damage that had been done. [VERB noun]

    她知道想要消除已经造成的损害是很难的。

  • If Michael won, he would undo everything I have fought for. [VERB noun]

    如果迈克尔赢了，那我一直以来努力争取的一切都将白费。

SYN reverse, cancel, offset, wipe out
3 VERB [usually passive] 破坏；毁掉 If a person, organization, or plan is undone by something, that thing causes their failure. 破坏；毁掉

  • They were undone by a goal from John Barnes. [be V-ed by n]

    约翰·巴恩斯的一粒进球使他们落败。

  • Macbeth is the story of a Scottish soldier who becomes king but is undone by his own ambition. [be V-ed by n]

    《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。

SYN ruin, defeat, destroy, wreck
4 See also: undoing  undone 
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