上下

verb

to climb up and climb down / to go upstream and downstream (such as on a river, or on a highway with “up” indicating towards a city)

彼は山を上下するのが好きです。

He likes to climb up and down the mountain.

意味（1）

to climb up and climb down

意味（2）

to go upstream and downstream (such as on a river, or on a highway with “up” indicating towards a city)