| Word | Definitions | Synonyms |
|---|---|---|
| foul | (verb) become soiled and dirty | - |
| (verb) make unclean | - | |
| (verb) spot, stain, or pollute | Synonyms: befoul, defile, maculate | |
| (verb) make impure | Synonyms: contaminate, pollute | |
| (verb) commit a foul; break the rules | - | |
| (verb) hit a foul ball | - | |
| (verb) become or cause to become obstructed | Synonyms: back up, choke, choke off, clog, clog up, congest, crap up |