godan verb (-su), intransitive verb
happen to ride together; share a vehicle
Describes the situation where people end up riding in the same vehicle (car, taxi, bus, etc.) by chance or arrangement.
駅まで知らない人と乗り合わした。
I happened to share a ride to the station with a stranger.
タクシーが一台しかなくて、他の客と乗り
There was only one taxi, so we ended up sharing it with other passengers.