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English definition of “balls (sth) up”

balls (sth) up

UK offensive phrasal verb with balls     /bɔːlz/ US  /bɑːlz/ verb
to spoil something by making a mistake or doing something stupid : Trust me to balls up the interview !Making mistakes
(Definition of balls (sth) up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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