spot, stain, or pollute; "The townspeople defiled the river by emptying raw sewage into it";
make impure; "The industrial wastes polluted the lake";
commit a foul; break the rules;
hit a foul ball;
become or cause to become obstructed; "The leaves clog our drains in the Fall"; "The water pipe is backed up";
especially of a ship''s lines etc; "with its sails afoul"; "a foul anchor";
disgustingly dirty; filled or smeared with offensive matter; "as filthy as a pigsty"; "a foul pond"; "a nasty pigsty of a room";
characterized by obscenity; "had a filthy mouth"; "foul language"; "smutty jokes";
thoroughly unpleasant; "filthy (or foul or nasty or vile) weather we''re having";
(of a baseball) not hit between the foul lines;
violating accepted standards or rules; "a dirty fighter"; "used foul means to gain power"; "a nasty unsporting serve"; "fined for unsportsmanlike behavior";
offensively malodorous; "a putrid smell";
(of a manuscript) defaced with changes; "foul (or dirty) copy";
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";
