foul up

Pronunciation

 * ; compare: foul-up.

Verb

 * 1)  To make a mistake, to go wrong.
 * You really fouled up this time.
 * 1)  To botch; to make a mess of.
 * I fouled up question 3 of the exam.

Synonyms

 * , (vulgar); see also Thesaurus:make a mistake
 * , (vulgar)