undoing
n. 毁灭；取消；毁灭的原因
vt. 解开；取消（undo 的 ing 形式）
例句
That one mistake was his undoing.
他一失足即成千古恨。
《牛津词典》
His lack of experience may prove to be his undoing.
缺乏经验可能就是他失败的原因。
《柯林斯英汉双解大词典》
By stopping smoking you are undoing most of the damage smoking has caused.
通过戒烟，你就是在消除吸烟所致的大多数危害。
