undo

动词 undo:

1. cancel, annul, or reverse an action or its effect
2. deprive of certain characteristics
   同义词：unmake
3. cause the ruin or downfall of
4. cause to become loose
   同义词：untie, loosen
5. remove the outer cover or wrapping of
   同义词：unwrap

1. The knot was fastened in such a way that it was impossible to undo.
   这个结系得那麽紧，根本解不开。
2. He undid most of the good work of his predecessor.
   他把前任的大部分业绩毁掉了。
3. That mistake has undone all our good work.
   那个过错使我们前功尽弃。
4. It's better for the doer to undo what he has done.
   解铃还需系铃人。
5. Our folly has undone us.
   我们的愚蠢行为将自己毁了。