(idiomatic, colloquial) Well-informed concerning.

present participle of up

The act of increasing something.

(idiomatic) To do or be involved in doing; to do (often something mischievous or inappropriate). / (idiomatic) To depend on, to be the choice of.

simple past tense and past participle of up

Used to indicate increase. / Used to indicate higher position or direction, literally or figuratively.

(colloquial) Abruptly; unexpectedly.

In a position of prominence or importance. / Used other than figuratively or idiomatically: see up, there.

(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.