Drink like a fish 形容一个人(习惯性地)饮酒过度、酗酒、豪饮。

【例句】
My mother used to drink like a fish, but she is giving up drinking. 　　
我妈妈过去经常喝酒很猛，但是她现在正在戒酒。

I used to drink like a fish and get drunk all the time.
我以前喝酒很猛，而且每次都喝醉。