(idiom, slang, mostly, imperative) To stay calm; to not get flustered or angry.
Keep your knickers on, mate. It was only a joke.
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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.
See all Regional & Other slang on Slangora.