ichidan verb, transitive verb
shut in; confine; seal in; trap
Physically enclosing someone or something so they cannot get out. Often used for locking up, sealing off, or trapping.
犯人は部屋に封じ込められた。
The criminal was confined in a room.
彼らは
They trapped the enemy inside the castle.
ichidan verb, transitive verb
contain; suppress; restrain; bring under control
Figurative use: keeping something abstract (emotions, power, information) from spreading or getting out of control.
怒りを封じ込めるのは難しい。
It's hard to suppress anger.
政府は情報を封じ込めようとした。
The government tried to contain the information.