up/ ʌp /
adverb
to, toward, or in a more elevated position:
to climb up to the top of a ladder.
to or in an erect position:
to stand up.
preposition
to, toward, or at an elevated place on or in:
They went up the stairs. The cat is up the tree.
to, toward, or at a high or higher station, condition, or rank on or in:
He is well up the social ladder.
adjective
moving in or related to a direction that is up or is regarded as up:
the up elevator; the up train traveling north; the up platform of a railroad station.
informed; familiar; aware (usually followed by on or in):
She is always up on current events.