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Phrase(s): wall something up
1. to seal something up behind a wall. • We simply walled the old furnace up. It was cheaper than removing it. • They walled up the old furnace. 2. to fill up an opening, such as a window or door, by building a wall. • We will have to hire someone to wall the doorway up. • They walled up the doorway.
McGrawhill's American Idioms And Phrasal Verbs