foul up /faʊl ˈʌp/verb 2/ˈfaʊl ʌp/ noun 1forms 4 verb2 •To botch; to make a mess of.I fouled up question 3 of the exam. •(slang) To make a mistake, to go wrong.You really fouled up this time. foul-up /ˈfaʊl ʌp/ noun1 •A disastrous mistake. formsfouled up · fouling up · fouls up · foul-ups
