B2 to unfasten something that is fastened or tied解开;打开;拆开
More examples
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.
B2 to remove the good or bad effects of an action or several actions消除,抵消(行为的效果)
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