加わる

くわわるkuwawaru

godan verb · intransitive

1. to be added to
2. to be appended
3. to join in (e.g. a group of friends)
4. to participate
5. to increase (e.g. heat)
6. to gain in (e.g. influence)
7. to grow
8. to gather (speed)

Study it in Yanamino