プログレッシブ和英中辞典(第4版)の解説
とじこもる【閉じ籠もる】
&fRoman1;〔部屋などに〕shut oneself in [up]
風邪のため彼は家に閉じこもっていた
A cold confined him to his house.／He was kept at home by a cold.
うちに閉じこもっていないで外に出なさい
You shouldn't shut yourself up in the house. Go outdoors.
部屋に鍵をかけて閉じこもる
lock oneself up in a room
&fRoman2;〔殻に〕
この子は自分の殻の中に閉じこもって心を開こうとしない
This child has withdrawn into his shell and won't open his heart to anyone.