upend upend /ʌˈpɛnd/

verb

1. Set, turn, or stand on end  ( upend )
   set, turn, or stand on end
    Upend the box and empty the contents
   upend the box and empty the contents
   
2. Become turned or set on end  ( upend )
   become turned or set on end
    The airplanes upended
   the airplanes upended