上下

What does 上下 mean in English?

1. top and bottom; high and low; above and below; upper and lower ends; up and down(n)
2. going up and down; rising and falling; fluctuating(n, vs)
3. going and coming back(n, vs)
4. upper and lower classes; ruler and ruled; the government and the people(n)
5. first and second volumes(n)