Source : Webster's Revised Unabridged Dictionary (1913)

Upcast \Up"cast`\, a.
   Cast up; thrown upward; as, with upcast eyes. --Addison.

Upcast \Up"cast`\, n.
   1. (Bowling) A cast; a throw. --Shak.

   2. (Mining.) The ventilating shaft of a mine out of which the
      air passes after having circulated through the mine; --
      distinguished from the downcast. Called also {upcast pit},
      and {upcast shaft}.

   3. An upset, as from a carriage. [Scot.]

   4. A taunt; a reproach. [Scot.] --Sir W. Scott.

Upcast \Up*cast"\, v. t.
   1. To cast or throw up; to turn upward. [Obs.] --Chaucer.

   2. To taunt; to reproach; to upbraid. [Scot.]

Source : WordNet®

upcast
     n : air passage consisting of a ventilation shaft through which
         air leaves a mine