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