籠もる

1. Origins, structure, and basic meaning

• Structure: 籠もる, read こもる, is an intransitive verb for a person remaining shut inside or for a smell lingering in an enclosed space.
• Basic usage: The containing place is marked by に, as in 部屋に籠もる and 車内ににおいが籠もる.

2. Common pitfalls and similar expressions

• Person and smell
  • With a person it describes staying indoors; with an odor it describes remaining trapped in the air.
• Intransitive pattern
  • The subject remains within the place rather than acting directly on it, so that place is not marked as a direct object with を.