The Collaborative International Dictionary of English v.0.48:

Pit \Pit\, v. t. [imp. & p. p. Pitted; p. pr. & vb. n.
   Pitting.]
   1. To place or put into a pit or hole.
      [1913 Webster]

            They lived like beasts, and were pitted like beasts,
            tumbled into the grave.               --T. Grander.
      [1913 Webster]

   2. To mark with little hollows, as by various pustules; as, a
      face pitted by smallpox.
      [1913 Webster]

   3. To introduce as an antagonist; to set forward for or in a
      contest; as, to pit one dog against another.
      [1913 Webster]

WordNet (r) 3.0 (2006):

pitting
    n 1: the formation of small pits in a surface as a consequence
         of corrosion [syn: pitting, roughness, indentation]