wall

An embankment built around a space for defensive purposes.

“they blew the trumpet and the walls came tumbling down”

(anatomy) a layer (a lining or membrane) that encloses a structure.

“stomach walls”

A difficult or awkward situation.

“his back was to the wall”

“competition was pushing them to the wall”

A layer of material that encloses space.

“the walls of the cylinder were perforated”

“the container's walls were blue”

A masonry fence (as around an estate or garden).

“the wall followed the road”

“he ducked behind the garden wall and waited”

An architectural partition with a height and length greater than its thickness; used to divide or enclose an area or to support another structure.

“the south wall had a small window”

“the walls were covered with pictures”

Anything that suggests a wall in structure or function or effect.

“a wall of water”

“a wall of smoke”

A vertical (or almost vertical) smooth rock face (as of a cave or mountain).

Surround with a wall in order to fortify.