[up-and-coming] {adj. phr.} Bound toward success; upwardly mobile; progressive; ambitious. * […]

[up-to-date] {adj.} Modem; contemporary; the latest that technology can offer. * […]

[up-to-the-minute] See: [UP-TO-DATE].

[upon one's head] See: [ON ONE'S HEAD].

[upon oneself] See: [TAKE ON ONESELF] also [TAKE UPON ONESELF].

[upon the spot] See: [ON THE SPOT] (1).

[upper] See: [KEEP A STIFF UPPER LIP], [ON ONE'S UPPERS].

[upper crust] {n.}, {informal} The richest, most famous, or important people […]

[upper hand] or [whip hand] {n.} Controlling power; advantage. * /In […]

[upper story] {n.} 1. A floor or level of a building […]