fouling
['faʊlɪŋ]
n.
（水管、枪筒等中的）污垢;
v.
使污秽( foul的现在分词 );
弄脏;
击球出界;
（通常用废物）弄脏;
例句:
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Middlesbrough's Jimmy Phillips was sent off for fouling Steve Tilson.
米德尔斯堡队的吉米·菲利普斯因为对史蒂夫·蒂尔森犯规而被罚下场。
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He was sent off for fouling the other team's goalkeeper.
他因对对方守门员犯规而被罚出场.
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A basketball player is allowed five personal fouls before fouling out.
篮球运动员侵人犯规五次即被罚下场.
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Nor is marine fouling a problem as it's well understood.
来自SA
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The employee stopped fouling up, and the boss stopping blowing up.
来自WSJ
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Too many people chasing resources and fouling up the planet in the process.
来自SA