上下 (jōge) means “up and down” | MotiTan Japanese Dictionary

More examples

荷物を持つと、腕が上下に動きます。ni motsu o mo tsu to ude ga jō ge ni ugo ki ma su

When you carry luggage, your arms move up and down.

It treats higher and lower positions as one vertical range or movement between the two.

昇降shōkō: Movement between a lower position and a higher position.
上げ下げagesage: The act of moving something to a higher or lower position.

上と下の方向、または物の上の部分と下の部分。ue to shita no hō kō ma ta wa mono no ue no bu bun to shita no bu bun

上下 (jōge) is a Sino-Japanese compound of 上 (jō, "up") and 下 (ge, "down"), combining opposite vertical directions.

In Japanese elevator controls, 上下ボタン (jōge botan) means the up and down buttons, so the word can label a pair of vertical controls.