vt.
使松开；解开；打开：
He undid his belt because it was too tight.
他解开了他的腰带，因为它太紧了。
使失效；使恢复原状：
What is done cannot be undone.
覆水难收。
取消，抹掉；废除：
The fire undid the work of eight months.
这场火灾使8个月干的活儿全白干了。
破坏；毁灭：
Our folly has undone us.
我们的愚蠢把我们毁了。
扰乱；使不安：
Mention of