(intransitive, of a fire) To burn more brightly.
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(intransitive, of a fire) to burst into flames from a seemingly non-burning state.
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(intransitive, or, transitive, slang) To begin smoking cannabis; to light up cannabis; to get high.
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Add your own interpretation of "blaze up".
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.