Proper noun
the red wall
(UK politics) A set of constituencies, in the Midlands, Northern England and North East Wales, which have historically tended to support the Labour Party.
Coordinate term: blue wall
the Red Wall
The supporters of the Wales national football team
But anyone who thinks the Tories will retain or extend their Red Wall victories by building more windmills is deluded. Source: Internet
Part of Starmer's problem is that for all his talk of reconstructing Labour's battered Northern Red Wall, he is at heart a classical North London liberal. Source: Internet