The Collaborative International Dictionary of English v.0.48:

Pitch \Pitch\, v. t. [imp. & p. p. Pitched; p. pr. & vb. n.
   Pitching.] [See Pitch, n.]
   1. To cover over or smear with pitch. --Gen. vi. 14.
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   2. Fig.: To darken; to blacken; to obscure.
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            The welkin pitched with sullen could. --Addison.
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The Collaborative International Dictionary of English v.0.48:

Pitching \Pitch"ing\, n.
   1. The act of throwing or casting; a cast; a pitch; as, wild
      pitching in baseball.
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   2. The rough paving of a street to a grade with blocks of
      stone. --Mayhew.
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   3. (Hydraul. Eng.) A facing of stone laid upon a bank to
      prevent wear by tides or currents.
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   Pitching piece (Carp.), the horizontal timber supporting
      the floor of a platform of a stairway, and against which
      the stringpieces of the sloping parts are supported.
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WordNet (r) 3.0 (2006):

pitching
    n 1: (baseball) playing the position of pitcher on a baseball
         team
    2: abrupt up-and-down motion (as caused by a ship or other
       conveyance); "the pitching and tossing was quite exciting"
       [syn: lurch, pitch, pitching]

Moby Thesaurus II by Grady Ward, 1.0:

37 Moby Thesaurus words for "pitching":
   archery, careening, casting, chucking, dangling, firing, flinging,
   gunnery, heaving, hurling, inclining, jaculation, leaning, lobbing,
   lurching, musketry, oblique, pitched, projection, reeling, rocking,
   rolling, shooting, skeet, skeet shooting, slinging, sloped,
   sloping, swaying, swinging, throwing, tilted, tilting, tipped,
   tossing, trajection, trapshooting