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1. To barricade, imprison, or enclose someone or something inside of some place. Often used in passive constructions. A noun or pronoun can be used between "wall" and "in." It was discovered that the guerillas had been walling in prisoners in the caves that overlook their encampment. Previous owners had walled in a child's bedroom at the back of the house, preserved exactly as it had been used back then.
2. To be like or act as a large wall that encircles or surrounds someone or something. Often used in passive constructions. A noun or pronoun can be used between "wall" and "in." Huge redwood trees wall in the tiny village, and they have remained completely cut off from the outside world for hundreds of years. The country is walled in by a vast mountain range.
wall someone or something in
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.