• vt. 取消；解开；破坏；扰乱
• vi. 撤消

un-, 使相反，do, 做。即把做好的解开，打开。

undo (v.)

Old English undon "to unfasten and open" (a window or door), "to unfasten by releasing from a fixed position; to cancel, discharge, abrogate, reverse what has been done, put back in a former condition; bring to ruin, destroy," from un- (2) "opposite of" + do (v.). Related: Undone; undoing.

1. 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。

来自柯林斯例句

2. 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。

来自柯林斯例句

3. 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。

来自柯林斯例句

4. Can you undo this knot?

你能解开这个结 吗 ?

来自《简明英汉词典》

5. His pride will undo him some day.

他的傲慢总有一天会毁了他.

来自《现代英汉综合大词典》