This is the 10197th most frequent Japanese word.
閉じ込め
Confinement; imprisonment; being trapped.
閉じ込められて: Here, it expresses the passive action of being confined or trapped.
彼は小さな部屋に閉じ込められてしまった。
He ended up being confined to a small room.
閉じ込められている: It is used figuratively to describe the feeling of being confined due to an illness.
風邪を引いてしまった彼女は、部屋に閉じ込められているような気がする。
Having caught a cold, she feels like she is confined to her room.
閉じ込めた: This is an active application where someone confines something securely in a space.