bottom fishing：低价购买，买便宜货

e.g. I don't think bottom fishing for stocks is always wise. There is always a good reason why the price is low.

我认为买低价股票不都是明智的，价钱低总是有原因的。

e.g. Bottom fishing probably won't get you anything of value.

买便宜货也许就买不到好东西。