Jisho

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Godan verb with 'ru' ending, Intransitive verb
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)​Usually written using kana alone
  • かれ彼
  • は
  • 、
  • よく
  • しょさい書斎
  • に
  • こもって
  • 、
  • こういう
  • もの
  • を
  • か書きます
  • 。
He often shuts himself up in the study and writes things like this.
Godan verb with 'ru' ending, Intransitive verb
2. to fill with (emotion, enthusiasm, power, etc.); to imbue with; to infuse with​Usually written using kana alone, See also 熱のこもった, oft. as ...のこもったもの
  • かれ彼
  • は
  • わたし私
  • に
  • あいじょう愛情
  • の
  • こもった
  • てがみ手紙
  • を
  • くれた
  • 。
He sent me an affectionate letter.
Godan verb with 'ru' ending, Intransitive verb
3. to fill a space (of a gas, smell, etc.); to be heavy with (e.g. smoke); to be stuffy; to be dense​Usually written using kana alone
Godan verb with 'ru' ending, Intransitive verb
4. to be muffled (e.g. of a voice)​Usually written using kana alone, See also こもった声
Godan verb with 'ru' ending, Intransitive verb
5. to hold (a castle, fortress, etc.)​Usually written using kana alone
Godan verb with 'ru' ending, Intransitive verb
6. to confine oneself in a temple to pray​Usually written using kana alone
Other forms
篭もる 【こもる】、隠る 【こもる】、篭る 【こもる】、籠る 【こもる】
Notes
隠る: Rarely-used kanji form. 篭る: Irregular okurigana usage. 籠る: Irregular okurigana usage.

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