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Walls have historically served defensive purposes, and the term "wall" originally referred to defensive walls and ramparts. Examples of famous defensive walls include the Great Wall of China and Hadrian's Wall. Walls can also be used for decorative or aesthetic purposes.

drive / push to the wall, to force into a desperate situation; humiliate or ruin completely. Not content with merely winning the match, they used every opportunity to push the inferior team to the wall.

A wall of people or things is a mass of them formed in such a way that you cannot get through or past them: (Definition of wall from the Cambridge Academic Content Dictionary © Cambridge University Press)

1. Extremely unconventional. 2. Without foundation; ridiculous: an accusation that is really off the wall.

Wall definition: An upright structure of masonry, wood, plaster, or other building material serving to enclose, divide, or protect an area, especially a vertical construction forming an inner partition or exterior siding of a building.

wall, structural element used to divide or enclose, and, in building construction, to form the periphery of a room or a building.

A wall is a long narrow vertical structure made of stone or brick that surrounds or divides an area of land. He sat on the wall in the sun. The well is surrounded by a wall only 12 inches high.

an immaterial or intangible barrier, obstruction, etc., suggesting a wall: a wall of prejudice. a wall-like, enclosing part, thing, mass, etc.: a wall of fire; a wall of troops.