undo

• Drink was his undoing .
  他酗酒是堕落的根源。
• It seemed to undo some of the mischief of the evening .
  似乎这天晚上那场恶作剧已经一笔勾销了。
• What's done cannot be undone .
  覆水难收。
• We cannot undo the past .
  往事不能挽回。
• The package came undone .
  行李解开了。
• He was not to know then that this was to prove his undoing .
  当时他并不知道，这件事为他种下了祸根。
• Winston undid the bit of string that held his overalls together .
  温斯顿把扎住工作服的一根绳子解开。
• Now the question is, whether it's worth while to undo all that has been done .
  现在的问题是半途而废是否值得。
• When the inevitable order came to "fix bayonets", he was undone .
  当“上刺刀”的口令传来时，他就变得失魂落魄。
• They would not succumb to this titan who was bent on undoing them .
  他们不愿向这个专门要损害他们的“巨人”让步。