undid

['ʌn'did]

v. 解开, 复原

例句与用法：

Your buttons areall undone.

你的钮扣全解开了。

He undid most of the good work of his predecessor.

他把前任的大部分业绩毁掉了。

He bent down and undid his shoelaces.

他俯下身来解开鞋带。

详细释义：

(undo的过去式)