Asperse

Webster's Dictionary of the English Language

·vt To sprinkle, as water or dust, upon anybody or anything, or to besprinkle any one with a liquid or with dust.

II. Asperse ·vt To bespatter with foul reports or false and injurious charges; to tarnish in point of reputation or good name; to slander or calumniate; as, to asperse a poet or his writings; to asperse a man's character.