(transitive, poetic or in certain phrases) To physically raise or lift. / (transitive, colloquial) To increase the level or amount of. / (transitive, colloquial) To promote.

(uncountable) The direction opposed to the pull of gravity. / (countable) A positive thing, or a time or situation when things are going well. / (particle physics) An up quark.

Away from the surface of the Earth or other planet; in opposite direction to the downward pull of gravity. / To or at a physically higher or more elevated position.

Toward the top of. / Toward the center, source, or main point of reference; toward the end at which something is attached. / From south to north of. / Further along (in any direction).

Facing upwards. / On or at a physically higher level. / Headed or designated to go upward (as an escalator, stairway, elevator etc.) or toward (as a run-up).

(informal) Legitimate; honest; upright.

Alternative spelling of on the up-and-up

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.

(colloquial) Abruptly; unexpectedly.