こもる

Also written 籠る, 籠もる, 篭る, 篭もる, 隠る

Meanings

Godan verb, Intransitive 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 fill with (emotion, enthusiasm, power, etc.); to imbue with; to infuse with (oft. as ...のこもったもの) See also: 熱のこもった (ねつのこもった).
to fill a space (of a gas, smell, etc.); to be heavy with (e.g. smoke); to be stuffy; to be dense
to be muffled (e.g. of a voice) See also: こもった声 (こもったこえ).
to hold (a castle, fortress, etc.)
to confine oneself in a temple to pray

彼は、よく書斎にこもって、こういうものを書きます。
He often shuts himself up in the study and writes things like this.
彼は私に愛情のこもった手紙をくれた。
He sent me an affectionate letter.
老婦人は子供たちに愛情のこもった手を差し伸べた。
The old woman extended a loving hand to the children.
トイレにこもってゲームするのやめてくれないかな。
Can you stop hiding in the toilet to play games?
週末はずっと家にこもってパソコンに向かってました。
I spent the whole weekend at home on the computer.

And 3 more.