Topic: BASEBALL
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foul2
1
a) [transitive] if a sports player fouls another player, they do something that is not allowed by the rules
b) DSB [intransitive and transitive] to hit a ball outside the limit of the playing area in baseball
2 also foul up [transitive] formal to make something very dirty, especially with waste : 
rivers and lakes fouled almost beyond recovery by pollutants
rivers and lakes fouled almost beyond recovery by pollutantsfoul up
phrasal verb1 to do something wrong or spoil something by making mistakes [↪ foul-up]: We can't afford to foul up this time.
We can't afford to foul up this time.2 to make something very dirty, especially with waste : He lit a cigarette and started to foul up the air with stinging yellow smoke.
foul something ↔ up
He lit a cigarette and started to foul up the air with stinging yellow smoke.