drink like a fish

Idioms  

1. Consume large amounts of alcoholic beverages, as in He always drinks like a fish at holiday dinners. The expression, first recorded in the mid-1600s, alludes to the way fish obtain oxygen, which causes them to be open-mouthed and appear to be constantly drinking.

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Example Sentences

To literally drink like a fish — submerged in water.

From Washington Post

“I drink like a fish,” he tells her, and she assures him that she will put a stop to all that: “You don’t know what a very strong character I have.”

From New York Times

However, what I’m saying is that you can’t expect to drink like a fish on the weekends and reach your weight loss goals, no matter how well you eat during the week.

From US News

Some people seem indestructible, smoke like a chimney, and drink like a fish, and never look the worse for it.

From Slate

Bottom line: Cocktails should not cause weight gain—unless you drink like a fish, choose those highest in calories, and overeat while you're drinking.

From US News