Definition of wall up phrasal verb from the Oxford Advanced American Dictionary

 

wall up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

wall somebodyup

[usually passive]
 
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to keep someone as a prisoner behind walls

wall somethingup

[usually passive]
 
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to fill an opening with a wall, bricks, etc. so that you can no longer use it I could see where the doorway had been walled up.
See the Oxford Advanced Learner's Dictionary entry: wall up