Foul up

фразовый глагол [используется в разговорной речи] портить Например: Don't foul up this chance. — Не упусти эту возможность. I hope the chairman won't foul things up. — Надеюсь, председатель ничего не испортит. Синоним(ы): balls up, botch up, bugger up, cock up, mess, screw up

Большой англо-русский словарь

Foul up

verb transitive verb 1. to make dirty; contaminate 2. to spoil by making mistakes or using poor judgment; confuse 3. entangle, block Example: fouled up communications intransitive verb to cause a foul-up; bungle Example: it was his fault. He had fouled up — Pat Frank

Merriam-Webster's Collegiate Dictionary