“悬崖勒马”，汉语成语，意思是在高高的山崖边上勒住马（draw [rein] in one’s horse at the edge of a cliff）。比喻到了危险的边缘及时清醒回头（desist from doing something before it is too late），可以翻译为“pull back before it is too late”。
- 现在是你悬崖勒马的时候了。
Now is the time for you to pull back before it is too late. - 犯罪分子应当迷途知返，悬崖勒马，不要在错误的道路上继续走下去。
The criminals should stop on the precipice, retract from the wrong path and not go any further. - 曾经有一个千载难逢的机会在我面前，我却把它浪费掉了。
I had the chance of a lifetime, and I blew it. - 这样的机会对你来说真是千载难逢。
It’s only once in a blue moon that you get an opportunity like that.
