From 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"
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"
