Definition from macmillandictionary.com
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On the opposite wall hung a valuable old painting.
She felt along the wall for the light switch.
The walls of the factory had been covered with graffiti.
Several men escaped over the prison’s perimeter wall yesterday.
the walls of the city
Over the top of the garden wall, he watched his neighbours.
Parts of the old brick walls had crumbled to the ground.
a sea wall
The years had built a wall between the two families.
A wall of silence had grown up between them.
a wall of books/boxes
A wall of dark water approached their small boat.
Firefighters battled the walls of flames.
inflammation of the bowel wall
What can I write on my boyfriend’s Facebook wall for his 16th birthday?