(slang, US, intransitive) To draw attention to something about to happen or already in progress in the hope of preventing it from proceeding.
It's alright to holler copper on a guy—but this guy was her friend.
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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.