動詞 undo:

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

1. Your buttons areall undone.
   你的鈕扣全解開了。
2. He undid most of the good work of his predecessor.
   他把前任的大部分業(yè)績毀掉了。
3. He bent down and undid his shoelaces.
   他俯下身來解開鞋帶。