(Multicultural London English, Northern England) I promise; no lie.
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To promise; swear; give one's word.
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To promise that something is (not) true.
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Add your own interpretation of "swear down".
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.