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English definition of “muck sth up”

muck sth up

informal phrasal verb with muck     /mʌk/ verb
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!Damaging and spoilingDestroying and demolishing
(Definition of muck sth up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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