籠(こ)もるto seclude oneself, to be confined in, to be filled (e.g. with emotion, satire, etc.), to be heavy (with), to be stuffy, to be implied

父(ちち)が書斎(しょさい)に籠(こ)もって執筆(しっぴつ)しています。

My father has secluded himself in his study and is writing. {to seclude oneself, to be confined in, to be filled (e.g. with emotion, satire, etc.), to be heavy (with), to be stuffy, to be implied}

自分(じぶん)の殻(から)に籠(こ)もっている人(ひと)は世界(せかい)が狭(せま)いままだ。

People who seclude themselves in their own shell remain in a narrow world. {to seclude oneself, to be confined in, to be filled (e.g. with emotion, satire, etc.), to be heavy (with), to be stuffy, to be implied}

お姫様(ひめさま)は王様(おうさま)から城(しろ)に籠(こ)もるように命令(めいれい)されています。

The princess has been ordered by the king to seclude herself in the castle. {to seclude oneself, to be confined in, to be filled (e.g. with emotion, satire, etc.), to be heavy (with), to be stuffy, to be implied}

声(こえ)が籠(こ)もってよく聞(き)こえないのでメガホンを使(つか)うことにしました。

I decided to use a megaphone because the voice was muffled and hard to hear. {to seclude oneself, to be confined in, to be filled (e.g. with emotion, satire, etc.), to be heavy (with), to be stuffy, to be implied}

会場(かいじょう)に人(ひと)の熱気(ねっき)が籠(こ)もっているとあって、空調(くうちょう)がなかなか効(き)きません。

Given that the venue is filled with people's fervor, the air conditioning doesn't seem to work effectively. {to seclude oneself, to be confined in, to be filled (e.g. with emotion, satire, etc.), to be heavy (with), to be stuffy, to be implied}