1. A skillful hand; a dabster; an expert.
  2. A name given to several species of flounders, esp. to the European species, Pleuronectes limanda. The American rough dab is Hippoglossoides platessoides.
  3. A gentle blow with the hand or some soft substance; a sudden blow or hit; a peck.
  4. A small mass of anything soft or moist.

v. i.

  1. To strike or touch gently, as with a soft or moist substance; to tap; hence, to besmear with a dabber.
  2. To strike by a thrust; to hit with a sudden blow or thrust.