Source : Webster's Revised Unabridged Dictionary (1913)

Undershot \Un"der*shot`\, a.
   1. (Zo["o]l.) Having the lower incisor teeth projecting
      beyond the upper ones, as in the bulldog.

   2. Moved by water passing beneath; -- said of a water wheel,
      and opposed to overshot; as, an undershot wheel.

Source : WordNet®

undershot
     See {undershoot}

undershoot
     v 1: fall short of (the runway) in a landing; "The plane
          undershot the runway"
     2: shoot short of or below (a target) [ant: {overshoot}]
     [also: {undershot}]

undershot
     adj : having a lower part projecting beyond the upper; "an
           underhung jaw"; "undershot bulldog" [syn: {underhung},
           {underslung}]