retaining wall

(usually capitalized) A collection of the worst or most hated entries in a particular subject, medium, field, or people who have failed to complete a challenge, etc.

A "wall" of overlapping shields formed by medieval soldiers standing next to each other

(Judaism, possibly offensive) The Western Wall.

(Judaism) An ancient wall on the western side of the Temple Mount in Jerusalem, remnant of the Jewish Second Temple. It is the holiest site in Judaism.

A wall covered by greenery.

A wall built on the winter sun side of a building with a glass external layer and a high mass internal layer separated by a layer of air, so as to absorb heat during sunlit hours of winter and slowly release it overnight.

plural of wall wart

(Islam) The Western Wall.

A knot made by unlaying the strands of a rope, and making a bight with the first strand, then passing the second over the end of the first, and the third over the end of the second and through the bight of the first.