fouling

动词 foul:

1. hit a foul ball
   同义词：foul
2. make impure
   同义词：pollute, foul, contaminate
3. become or cause to become obstructed
   同义词：clog, choke off, clog up, back up, congest, choke, foul
4. commit a foul; break the rules
   同义词：foul
5. spot, stain, or pollute
   同义词：foul, befoul, defile, maculate
6. make unclean
   同义词：foul
7. become soiled and dirty
   同义词：foul

1. He was sent off by the referee for persistent fouling.
   他因连续犯规被裁判勒令退场。
2. The factories are responsible for fouling up the air for miles around.
   这些工厂造成了很大范围的空气污染。