1.an act that violates of the rules of a sport
2.highly offensive; arousing aversion or disgust;
a disgusting smell
3.offensively malodorous;
a putrid smell
4.violating accepted standards or rules;
a dirty fighter
5.(of a baseball) not hit between the foul lines
6.(of a manuscript) defaced with changes;
foul (or dirty) copy
7.thoroughly unpleasant;
filthy (or foul or nasty or vile) weather we're having
8.characterized by obscenity;
had a filthy mouth
9.disgustingly dirty; filled or smeared with offensive matter;
as filthy as a pigsty
10.especially of a ship's lines etc;
with its sails afoul
1.hit a foul ball
2.make impure;
The industrial wastes polluted the lake
3.become or cause to become obstructed;
The leaves clog our drains in the Fall
4.commit a foul; break the rules
5.spot, stain, or pollute;
The townspeople defiled the river by emptying raw sewage into it
6.make unclean;
foul the water
7.become soiled and dirty