See dab in Webster's New World Roget's A-Z Thesaurus II
verb
To spread with a greasy, sticky, or dirty substance:
bedaub, besmear, daub, plaster, smear, smirch, smudge. See put on
noun
A tiny amount:
bit1, crumb, dash, dot, dram, drop, fragment, grain, iota, jot, minim, mite, modicum, molecule, ort, ounce, particle, scrap1, scruple, shred, smidgen, speck, tittle, trifle, whit. (Chiefly British) spot. See big
Learn more about dab