1. top and bottom; high and low; above and below; upper and lower ends; up and down
人の視界というのは上下の幅が狭い。The vertical field of human vision is narrow.
Noun
Verb (する, intransitive)
2. going up and down; rising and falling; fluctuating
それぞれが、激しく肩を上下させている。Each of them is heaving their shoulders up and down violently.
3. going and coming back
4. upper and lower classes; ruler and ruled; the government and the people
昔は身分の上下がはっきりしていた。In the old days, the line between the upper and lower classes was clear.
5. first and second volumes
6. top and bottom; two-piece (outfit)