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English definition of “foul up (something)”

foul up (something)

infml phrasal verb with foul    /fɑʊl/ verb
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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