get up

1.  Arise from bed; also, sit or stand up. For example, Once I get up and have coffee, I'm ready to work. One of Irving Berlin's earliest hit songs was "Oh! How I hate to Get Up in the Morning" (1918). [Mid-1300s]
2.  Ascend, mount, as in I hate to get up on a ladder. [First half of 1500s]
3.  Create or organize, as in She got up the petition against zoning. [Late 1500s]
4.  Dress or adorn, as in She plans to get herself up in a bizarre outfit. This usage is most often put in the form of the past participle (got up), as in The wedding albums were got up with ruffles and lace. [Late 1700s]
5.  Draw on, create in oneself, as in I finally got up the nerve to quit, or Joe got up his courage and told the boss he was leaving. [Early 1800s] Also see get someone's back up; also see the subsequent idioms beginning with get up.

The verb has 8 meanings:

Meaning #1: rise to one's feet
  Synonyms: arise, rise, uprise, stand up

Meaning #2: get up and out of bed
  Synonyms: turn out, arise, uprise, rise
  Antonym: go to bed (meaning #1)

Meaning #3: raise from a lower to a higher position
  Synonyms: raise, lift, elevate, bring up

Meaning #4: cause to rise

Meaning #5: develop, as of an appetite
  Synonym: work up

Meaning #6: put on special clothes to appear particularly appealing and attractive
  Synonyms: dress up, fig out, fig up, deck up, gussy up, fancy up, trick up, deck out, trick out, prink, attire, rig out, tog up, tog out, overdress

Meaning #7: arrange by systematic planning and united effort
  Synonyms: organize, organise, prepare, devise, machinate

Meaning #8: study intensively, as before an exam
  Synonyms: cram, grind away, drum, bone up, swot, mug up, swot up, bone