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).

(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.

present participle of up

The act of increasing something.

Next to; near; towards; as far as. / Capable of. / Ready for. / Willing to participate in. / As much as; no more than. / Until. / For the option or decision of. / Doing; involved in.

maximum of.

(idiomatic) Willing to participate in; interested in. / (idiomatic) Being or due to be evaluated, inspected, judged, considered, sold, etc., in the stated circumstances or by the stated method.

(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.

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