Definition from Wiktionary, the free dictionary
- (transitive) To end up; to set on end.
- To tip or turn over.
- When he upended the bottle of water over his sleeping sister, the lid popped off and surprised them both.
- To destroy, invalidate, overthrow, or defeat.
- The scientific evidence upended the popular myth.
to end up; to set on end
to tip or turn over
to destroy, invalidate