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

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

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

"I'm a seatotaller myself," he observed; "I don't drink like a fish, nor go in for cups."

From Project Gutenberg

"To drink like a fish" is a shameful and utterly unfounded aspersion upon a blameless creature of most correct habits and model deportment.

From Project Gutenberg