Read the dictionary definition of foul. All definitions for this word.
1. an act that violates the rules of a sport
2. become soiled and dirty
3. make unclean
1. foul the water
4. spot, stain, or pollute
1. The townspeople defiled the river by emptying raw sewage into it
5. make impure
1. The industrial wastes polluted the lake
6. commit a foul; break the rules
7. hit a foul ball
8. become or cause to become obstructed
1. The leaves clog our drains in the Fall
2. The water pipe is backed up
9. especially of a ship's lines etc
1. with its sails afoul
2. a foul anchor
10. disgustingly dirty; filled or smeared with offensive matter
1. as filthy as a pigsty
2. a foul pond
3. a nasty pigsty of a room
11. characterized by obscenity
1. had a filthy mouth
2. foul language
3. smutty jokes
12. (of a baseball) not hit between the foul lines
13. violating accepted standards or rules
1. a dirty fighter
2. used foul means to gain power
3. a nasty unsporting serve
4. fined for unsportsmanlike behavior
14. offensively malodorous
1. a foul odor
2. the kitchen smelled really funky
15. (of a manuscript) defaced with changes
1. foul (or dirty) copy
16. highly offensive; arousing aversion or disgust
1. a disgusting smell
2. distasteful language
3. a loathsome disease
4. the idea of eating meat is repellent to me
5. revolting food
6. a wicked stench