“drink like a fish”不是指“像鱼一样喝”，真实含义习惯性地饮酒过度，酗酒，豪饮，饮酒过度。

【例句】
My father used to drink like a fish, but now he drinks very little to keep healthy.
我爸爸以前经常酗酒，但现在他为了健康，很少喝酒了。

When I was young I could drink like a fish and eat like a pig.
我年轻时酒量和食量都很惊人。