Meaning of “foul up (something)” in the English Dictionary

american-english dictionary

"foul up (something)" in American English

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foul up (something)

phrasal verb with foul us /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)