(UK) Large girls' underpants traditionally worn as shorts during school sports activities.
"But instead of going there, I sneaked into the Trunchbull's room. And after a speedy search I found the drawer where she kept all her gym knickers."
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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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