wall something ↔ inphrasal verb
wall something ↔ offphrasal verb
The control room is walled off by soundproof glass.
wall somebody/something ↔ upphrasal verb
to fill in an entrance, window etc with bricks or stone:
The entrance had long since been walled up.
to fill in all the entrances and windows of a place so that someone cannot get out
to keep someone as a prisoner in a building