verb (used with object)
- to set on end, as a barrel or ship.
- to affect drastically or radically, as tastes, opinions, reputations, or systems.
- to defeat in competition, as in boxing or business.
verb (used without object)
- to become upended.
- to place the body back-end up, as a dabbling duck.
- to turn or set or become turned or set on end
- (tr) to affect or upset drastically
v.1823, from up + end. Related: Upended; upending.