Drinks like a fish

Someone who drinks a lot

John smokes like a chimney and drinks like a fish.

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drink like a fish

to drink to excess

He was unaware of the danger that could come to him if he were to drink like a fish and as a result he almost succumbed to alcohol poisoning.

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Drinking like a fish out of water

Consuming large quantities of alcohol in order to feel comfortable in a place you don't belong.

"I didn't want to be there. So I started drinking like a fish out of water"

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