If you say that someone is on the edge of a precipice, you mean that they are in a dangerous situation in which they are extremely close to disaster or failure.
例句
I was beginning to admit to myself that our marriage was rolling toward the edge of a precipice...我内心开始承认我们的婚姻正走向危险的边缘。The King now stands on the brink of a political precipice.国王现在处于政治上岌岌可危的境地。
英汉词典释义
n.
悬崖,峭壁
The climber fell down a precipice.爬山者跌下了悬崖。The hut hung half over the edge of the precipice.那间小屋有一半悬在峭壁边上。A slight carelessness on this precipice could cost a man his life.在这悬崖上稍一疏忽,就会使人丧生。