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English definition of “do sb/yourself a mischief”

do sb/yourself a mischief

UK informal
to hurt someone or yourself: You'll do yourself a mischief if you're not careful with that knife.Treating people or animals badlyInsults and abuseUnkind, cruel and unfeelingViolent or aggressive
(Definition of do sb/yourself a mischief from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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