Longman Dictionary of Contemporary English homepage

wall

2 verb
     
wall2

wall something ↔ in

phrasal verb
to surround an open area with walls

wall something ↔ off

phrasal verb
to keep one area or room separate from another, by building a wall:
The control room is walled off by soundproof glass.

wall somebody/something ↔ up

phrasal verb
1
a) TBC to fill in an entrance, window etc with bricks or stone:
The entrance had long since been walled up.
b) to fill in all the entrances and windows of a place so that someone cannot get out
2SCJ to keep someone as a prisoner in a building
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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