Wall off is a term used to describe the process of enclosing an area with a wall or other barrier. It is commonly used in construction to create a secure and private space, such as a backyard or a room. Wall off can also be used to separate two areas, such as a living room and a kitchen. The term is derived from the verb 'to wall off, ' which means to build a wall around something. The crossword solution for wall off is 'ENCLOSE, ' which means to surround or block off an area with a wall or other barrier.