What does DOWN mean?

adjective

1. being or moving lower in position or less in some value“lay face down”
2. extending or moving from a higher to a lower place“the down staircase”
3. becoming progressively lower“the down trend in the real estate market”
4. being put out by a strikeout“two down in the bottom of the ninth”
5. understood perfectly“had his algebra problems down”
6. lower than previously“the market is depressed”
7. shut“the shades were down”
8. not functioning (temporarily or permanently)“we can't work because the computer is down”