• 降車こうしゃ — getting off a vehicle
• 降雨こうう — rainfall
• 降格こうかく — demotion
• 以降いこう — after / from this point on
• 降おりる — to get off / to go down
• 降おろす — to unload / to let off
• 降ふる — to fall (rain, snow)

降 is used for moving downward from a higher point, literally or figuratively. It’s common in transportation (getting off), weather (rainfall), and status change (降格). The radical 阝（こざとへん）relates to hills or mounds, hinting at movement over terrain.