Verb (5-dan, る, intransitive)
Usually written in kana
1. to shut oneself in (e.g. one's room); to be confined in; to seclude oneself; to hide away; to stay inside (one's shell)
2. to be filled with (emotion, enthusiasm, etc.)
3. to fill the room (of a gas, smell, etc.); to be heavy with (e.g. smoke); to be stuffy; to be dense