fish in troubled waters 混水摸鱼

“混水摸鱼”，汉语成语，亦作“浑水摸鱼”，原指在混浊的水中，鱼晕头转向，乘机摸鱼，可以得到意外的好处，比喻趁混乱的时候从中捞取不正当的利益（acquire profit in time of trouble）。与英文俗语“fish in troubled waters”意思相近，表示“to try to capitalize on or benefit from a situation, circumstance, or experience that is fraught with disorder, difficulty, confusion, stress,etc”。

例句：

要提防那些混水摸鱼的人。

Be aware of those who fish in troubled waters.

他经常买进宣布破产的公司的股票，这种混水摸鱼的方法通常能成功。

He often buys up stock in companies declaring bankruptcy; fishing in troubled waters generally pays off.