noun, noun or participle which takes 'suru'
riding in the same carriage (with a superior); attending on a superior in the same vehicle
Formal term used primarily in imperial or high-ranking official contexts. Describes the act of accompanying a superior (such as the Emperor) in the same vehicle.
天皇陛下に陪乗する栄誉を賜った。
I was granted the honor of riding in the same carriage with His Majesty the Emperor.
式典では、侍
At the ceremony, the chamberlain attended on the superior in the car.