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English definition of “muck sth up”

muck sth up

informal
verb uk phrasal verb with muck   /mʌk/ us  
to spoil something completely, or do something very badly: I really prepared for the interview because I didn't want to muck it up. I mucked up the whole exam!
(Definition of muck sth up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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