to contain someone or something behind or within a wall. (Implies a constriction of space, but not necessarily an inescapable area. See wall something up.) The count walled his prisoner in permanently. Jane decided to wall in the little garden at the side of the house. She walled the garden in.
To enclose, surround, or fortify something with or as if with a wall: We walled in the back stairway so that it couldn't be seen. The soldiers walled the fort in with logs. The valley was walled in by mountains.