Read the dictionary definition of up. All definitions for this word.
1. raise
1. up the ante
2. out of bed
1. are they astir yet?
2. up by seven each morning
3. used up
1. time is up
4. (used of computers) operating properly
1. how soon will the computers be up?
5. open
1. the windows are up
6. (usually followed by `on' or `for') in readiness
1. he was up on his homework
2. had to be up for the game
7. extending or moving toward a higher place
1. the up staircase
2. a general upward movement of fish
8. getting higher or more vigorous
1. its an up market
2. an improving economy
9. being or moving higher in position or greater in some value; being above a former position or level
1. the anchor is up
2. the sun is up
3. he lay face up
4. he is up by a pawn
5. the market is up
6. the corn is up
10. spatially or metaphorically from a lower to a higher position
1. look up!
2. the music surged up
3. the fragments flew upwards
4. prices soared upwards
5. upwardly mobile
11. to a later time
1. they moved the meeting date up
2. from childhood upward
12. to a more central or a more northerly place
1. was transferred up to headquarters
2. up to Canada for a vacation
13. nearer to the speaker
1. he walked up and grabbed my lapels
14. to a higher intensity
1. he turned up the volume
See also:
Merriam-Webster definition of up