foul up

• (Received Pronunciation) IPA^(key): /faʊl ˈʌp/; compare: foul-up.

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foul up (third-person singular simple present fouls up, present participle fouling up, simple past and past participle fouled up)

1. (intransitive, slang, idiomatic) To make a mistake, to go wrong.

   You really fouled up this time.

2. (transitive) To botch; to make a mess of.

   I fouled up question 3 of the exam.

• (make a mistake): mess up, fuck up (vulgar); see also Thesaurus:make a mistake
• (botch): mess up, fuck up (vulgar)

• foul-up