The Collaborative International Dictionary of English v.0.48:

Overshot \O"ver*shot`\, a.
   From Overshoot, v. t.
   [1913 Webster]

   Overshot wheel, a vertical water wheel, the circumference
      of which is covered with cavities or buckets, and which is
      turned by water which shoots over the top of it, filling
      the buckets on the farther side and acting chiefly by its
      weight.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Overshot \O"ver*shot`\, a. (Zool.)
   Having the upper teeth projecting beyond the lower; -- said
   of the jaws of some dogs.
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Overshoot \O`ver*shoot"\, v. t. [imp. & p. p. Overshot; p. pr.
   & vb. n. Overshooting.]
   1. To shoot over or beyond; to miss; as, to overshoot a mark;
      to overshoot the green in golf. "Not to overshoot his
      game." --South.
      [1913 Webster]

   2. Hence: To go beyond an intended point or limit; as, to
      overshoot the runway in landing an airplane; to overshoot
      the endpoint in a titration.
      [PJC]

   2. To pass swiftly over; to fly beyond. --Hartle.
      [1913 Webster]

   3. To exceed; as, to overshoot the truth. --Cowper.
      [1913 Webster]

   To overshoot one's self, to venture too far; to assert too
      much.
      [1913 Webster]

WordNet (r) 3.0 (2006):

overshot
    adj 1: having an upper part projecting beyond the lower; "an
           overshot jaw"