foul up's Usage Examples:

for the sail to foul upon when it is being raised, particularly if it is battened, and the lines and the connections between them can chafe and beat upon.

In retaliation, the workers pull a slow-down and deliberately foul up the pajamas, but when Babe actually sabotages some machinery, Sid fires.

unpleasant odour; the opening of a flask of allyl [iso]cyanide is enough to foul up the air in a room for several days).

cooler than the other three and as a consequence the spark plug tended to foul up, particularly if the engine was often used in city traffic.

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one of the boxing gloves in ether, but Burns and Houlihan, looking to foul up them up, swap the ether for water.

Synonyms:

bollix up, fail, bollix, flub, muff, fluff, go wrong, bodge, bollocks up, fumble, muck up, fuck up, miscarry, bollocks, bobble, bungle, botch, mishandle, botch up, ball up, blow, bumble, louse up, spoil, screw up, mess up,

Antonyms:

succeed, function, stay, keep track, pay up,