undo the knot 解开结
undo a decision 撤销决定
undo the damage 消除影响
A: This mistake undoes everything we've achieved.
A：这个错误破坏了我们所取得的一切。
B: Is there any way to undo it?
B：有什么办法可以撤销它吗？
1) 撤销/取消
2) 解开/拆开
3) 破坏/使失效
1. 撤销，取消
2. 解开
verb
1. to cancel or reverse the effects of something
Synonym: reverse, annul