(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.

plural of upping

(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

(idiomatic) Hidden, in reserve.

(archaic, idiomatic) Annoyed, angry.

Alternative form of step up one's game