"fouling" in the verb sense
1. foul
hit a foul ball
2. pollute, foul, contaminate
make impure
"The industrial wastes polluted the lake"
3. clog, choke off, clog up, back up, congest, choke, foul
become or cause to become obstructed
"The leaves clog our drains in the Fall"
"The water pipe is backed up"
4. foul
commit a foul break the rules
5. foul, befoul, defile, maculate
spot, stain, or pollute
"The townspeople defiled the river by emptying raw sewage into it"
6. foul
make unclean
"foul the water"
7. foul
become soiled and dirty
Source: WordNet® (An amazing lexical database of English)
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