What does "dab" mean?

Dab: To strike or touch gently, as with a soft or moist substance; to tap; hence, to besmear with a dabber. A sore should . . . be wiped . . . only by dabbing it over with fine lint. S. Sharp.

Additional senses

  1. 2.To strike by a thrust; to hit with a sudden blow or thrust. "To dab him in the neck." Sir T. More.
  2. 3.A gentle blow with the hand or some soft substance; a sudden blow or hit; a peck. Astratch of her clame, a dab of her beack. Hawthorne.
  3. 4.A small mass of anything soft or moist.

Sources