To cork off is American slang for falling asleep, usually suddenly or when you probably shouldn't — like nodding off on the couch mid-movie or dozing during a long meeting. The phrase has a vintage, mid-century American feel and conjures the image of someone just switching off like a light. It's casual and slightly humorous, more often used to describe someone else's impromptu nap than your own.
We were halfway through the game when he just corked off on the recliner and started snoring.
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(US, slang) To fall asleep.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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