What is the meaning of the word "down"?

Definitions:

a complete play to advance the football, in American football noun
- You have four downs to gain ten yards.
away from a more central or a more northerly place adverb
- was sent down to work at the regional office
being or moving lower in position or less in some value adjective
- lay face down
cause to come or go down verb
- The policeman downed the heavily armed suspect
drink down entirely verb
- They downed three martinis before dinner.
eat immoderately verb
- Some people can down a pound of meat in the course of one meal
from an earlier time adverb
- the story was passed down from father to son
in an inactive or inoperative state adverb
- the factory went down during the strike
not functioning (temporarily or permanently) adjective
- we can't work because the computer is down
paid in cash at time of purchase adverb
- put ten dollars down on the necklace
shut adjective
- the shades were down
spatially or metaphorically from a higher to a lower level or position adverb
- don't fall down
to a lower intensity adverb
- The stagehand slowly phased down the light until the stage was completely black.
understood perfectly adjective
- I had my algebra problems down.