To eat a meal at home.
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(UK) To eat a purchased meal on the premises where one bought it, rather than taking it away.
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To etch or erode a substance. (of acid).
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Add your own interpretation of "eat in".
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.
See all Regional & Other slang on Slangora.