Quick definitions from Macmillan ( )

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Quick definitions from WordNet (foul)

▸ noun:  an act that violates of the rules of a sport
▸ verb:  become soiled and dirty
▸ verb:  make unclean ("Foul the water")
▸ verb:  spot, stain, or pollute
▸ verb:  commit a foul; break the rules
▸ verb:  hit a foul ball
▸ verb:  make impure
▸ verb:  become or cause to become obstructed
▸ adjective:  (of a baseball) not hit between the foul lines
▸ adjective:  (of a manuscript) defaced with changes ("Foul (or dirty) copy")
▸ adjective:  especially of a ship's lines etc ("With its sails afoul")
▸ adjective:  disgustingly dirty; filled or smeared with offensive matter ("A foul pond")
▸ adjective:  characterized by obscenity ("Foul language")
▸ adjective:  thoroughly unpleasant ("Filthy (or foul or nasty or vile) weather we're having")
▸ adjective:  violating accepted standards or rules ("Used foul means to gain power")
▸ adjective:  offensively malodorous
▸ adjective:  highly offensive; arousing aversion or disgust

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▸ Word origin