UP

noun

1. The direction opposed to the pull of gravity.
2. A positive thing.
3. An upstairs room of a two story house.

verb

1. To increase or raise.
2. To promote.
3. (usually in combination with another verb) To act suddenly.

adjective

1. Facing upwards.
2. On or at a physically higher level.
3. Headed, or designated to go, upward, as an escalator, stairway, elevator etc.