Definition of "bruvver"

Gurdjieff I thot a man an a bruvver, but NObuddy is goin to swallow Ouspensky

1953, Ezra Pound, letter to Margaret Anderson, reproduced in Thomas L. Scott et al. (editors), Pound/The Little Review: the Letters of Ezra Pound to Margaret Anderson, New Directions Books (1988), page 314

Gawd knows when yer bruvver's gonna get married.

1992, Harry Bowling, The girl from Cotton Lane, Headline Book Publishing

Chicken was still elated. "I was way up there, wasn’t I? Wasn’t I? I’m a tell my brovver."

1973, Toni Morrison, Sula, page 60