1. the top and bottom of sth

2. the full vertical extent of sth; from top to bottom

3. to go up and down

4. before and after (as in 上下文 (shàngxiàwén) "context")

5. (used after a quantity) approximately; ... or so

6. (in a social hierarchy) the high and the low; seniors and juniors (as in 上下和睦 (shàngxiàhémù) "harmony between superiors and subordinates")

7. all members of a group (as in 举国上下 (jǔguóshàngxià) "the entire nation")

8. relative superiority (as in 不相上下 (bùxiāngshàngxià) "evenly matched")