undo

柯林斯词典

1. V-T 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. 打开; 解开; 松开
I managed secretly to undo a corner of the parcel. 我设法偷偷地打开包裹的一角。
I undid the bottom two buttons of my yellow and grey shirt. 我解开了我黄灰色相间衬衫最下面的两个钮扣。
2. V-T To undo something that has been done means to reverse its effect. 使无效
A heavy-handed approach from the police could undo that good impression. 警察的专制手段能使那个好印象化为乌有。
She knew it would be difficult to undo the damage that had been done. 她知道难以挽回已造成的损失。
3. →see also undoing

I undid the buttons on my blouse .
He had eaten so much that he had to undo his belt a couple of notches .
He had undone the buttons of his shirt , exposing an unsightly expanse of white flesh .
If the curtains are too short you could undo the hem to make them a bit longer .
He gently began to undo the zip at the back of her dress .