The Collaborative International Dictionary of English v.0.48:

Upend \Up*end"\, v. t.
   To end up; to set on end, as a cask.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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"

Moby Thesaurus II by Grady Ward, 1.0:

38 Moby Thesaurus words for "upend":
   beat, cast up, clobber, drub, elevate, erect, honeycomb, lick,
   lift up, overset, overthrow, overturn, overwhelm, pitch, raise,
   raise aloft, raise up, rear, rear aloft, sap, sap the foundations,
   set up, shellac, stand upright, subvert, throw down, throw over,
   trim, trounce, undermine, upheave, uplift, upraise, uprear,
   upright, upset, wallop, weaken