From 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.
[1913 Webster]
2. Fig.: To darken; to blacken; to obscure.
[1913 Webster]
The welkin pitched with sullen could. --Addison.
[1913 Webster]
From 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.
[1913 Webster]
2. The rough paving of a street to a grade with blocks of
stone. --Mayhew.
[1913 Webster]
3. (Hydraul. Eng.) A facing of stone laid upon a bank to
prevent wear by tides or currents.
[1913 Webster]
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.
[1913 Webster]