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to lock up; to shut up; to imprison
部屋へやに閉じ込めとじこめられた。
I was locked in the room.
猫ねこを部屋へやに閉じ込めとじこめた。
I shut the cat in the room.
感情かんじょうを心こころに閉じ込めるとじこめる。
She keeps her feelings locked in her heart.