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To cover an opening with bricks. The contractor is going to brick up the windows in this room before he starts working on the addition.
brick something up
to fill up an opening with bricks. He bricked the doorway up. Why did he brick up the opening?
To fill or block an opening with a wall of bricks: The owners of the old factory bricked up the windows to keep animals and curious children out. The builders bricked the old doorway up and covered it with drywall.