立てこもる

たてこもる, たてごもるtatekomoru

godan verb · intransitive

1. to shut oneself in (one's house, room, etc.)
2. to confine oneself (to)
3. to barricade oneself (in a building)
4. to entrench oneself
5. to hole up
6. to hold (a castle, etc.)

Study it in Yanamino