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English definition of “foul up (something)”

foul up (something)

infml
verb phrasal verb with foul  /fɑʊl/ us  
to spoil or damage something, esp. by making a mistake or doing something stupid: I think antipollution devices really foul up a lot of engines. If you foul up, tell the president and correct it fast.
(Definition of foul up (something) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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