悬崖勒马yīngwénjièshì:

n.  wake up to the danger at last moment n.  rein in at the brink of the precipice , , wake up to and escape disaster at the last moment v.  (literally) to rein in the horse at the edge of a precipice--to stop just before v.  commiting a serious blunder

(fēizhùcèchéngyuánměiyèzànxiàn 4 lì)

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