Source : Webster's Revised Unabridged Dictionary (1913)

Upend \Up*end"\, v. t.
   To end up; to set on end, as a cask.

Source : WordNet®

upend
     v 1: become turned or set on end; "the airplanes upended"
     2: set, turn, or stand on end; "upend the box and empty the
        contents"