Live Over The Brush Meaning

(Northern England, idiomatic) To cohabit without being married.

Example: 1982, Peter Tinniswood, The Home Front, page 10:
  I know what people think about the North. They think it's all muck and living over the brush with women like Elsie Tanner.
1991, Punch, volume 300, page 134:
  After the birth of their son, Stanley, the couple moved to Bradford and "lived over the brush" in West Bowling in a back-to-back terraced house.
2013, Gilda O'Neill, Just Around the Corner, ISBN 1448185238:
  I was saying to my Albert, I wouldn't be surprised if him and that so-called wife of his was living over the brush.