dab

a light touch or stroke. Synonyms: tap, pat.

a small quantity of something moist or liquid. Synonyms: splash, splatter. Examples: "A dab of paint." "A splatter of mud." "Just a splash of whiskey."

apply (usually a liquid) to a surface. Synonyms: swab, swob. Examples: "Dab the wall with paint."

hit lightly. Synonyms: pat. Examples: "Pat him on the shoulder."