(intransitive, slang, idiomatic) To make a mistake, to go wrong.
You really fouled up this time.
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(transitive) To botch; to make a mess of.
I fouled up question 3 of the exam.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.