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English definition of “muddle sth up”

muddle sth up

verb uk phrasal verb with muddle   /ˈmʌd.l̩/ us  
C2 to arrange things in the wrong order: I've arranged the books alphabetically so don't muddle them up.Making things dirty and untidy
(Definition of muddle sth up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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