(a) To render (something) materially foul, unclean, or impure; to dirty, soil, pollute; (b) fig. to pollute or defile (the mouth, the air) with false or evil words; (c) to void excrement, defecate. …

(a) To make (something) dirty, to soil, to pollute; (b) to be or become filthy; (c) to void excrement. …