To sprinkle, as water or dust, upon anybody or anything, or to besprinkle any one with a liquid or with dust.
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.
asperse in French is diffamer
asperse in Italian is calunniare
asperse in Spanish is calumniar