Definition from Wiktionary, the free dictionary
on; up; on top; upon; first (of two parts); previous or last (week, etc.); upper; higher; above; previous; to climb; to go into; above; to go up
to walk; to tour; to roam; to swim; to travel
|simp. and trad.
- upstream portion of a river
- (figuratively) favourable position, advantage, edge
- (figuratively) (one's) superior, superordinate