(idiomatic) rising; becoming greater in number or magnitude. / (sports) While the ball is rising.

(literally and figuratively) The state, quality, or condition of being up / (quantum mechanics) The property of being an up quark.

Initialism of Upper Peninsula. / (religion) Initialism of United Presbyterian. / (India) Initialism of Uttar Pradesh. / (software) Initialism of Unified Process.

Initialism of unqualified prospect. / Initialism of university press.

(tennis) Of the ball, having bounced twice. Usually called by the umpire in situations where it is unclear if the ball has bounced a second time to indicate to the players and spectators that the point is over.

plural of UP

optimistic; uplifting; positive

present participle of up one's game

(idiomatic) To desist from saying something unless one is able to prove it; to act in a manner that makes further talk unnecessary.

(literally) The act of assisting another's progress over a wall or other obstacle by forming a step for one of their feet with one's hands.