godan ~る verb / intransitive verb:

• 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)
• to be filled with (emotion, enthusiasm, etc.)
• to fill the room (of a gas, smell, etc.); to be heavy with (e.g. smoke); to be stuffy; to be dense
• to be muffled (e.g. voice)
• to hold (a castle, fortress, etc.)
• to confine oneself in a temple to pray