What is the meaning of dab?

noun

• A light touch or stroke.
  • synonyms: tap, pat
• A small quantity of something moist or liquid.
  • usage: "a dab of paint"; "a splatter of mud"; "just a splash of whiskey"
  • synonyms: splash, splatter

verb

• Apply (usually a liquid) to a surface.
  • usage: "dab the wall with paint"
  • synonyms: swab, swob
• Hit lightly.
  • usage: "pat him on the shoulder"
  • synonyms: pat