or Frère. A friar not in orders. (See Father.)
(So-and-so). A fellow-barrister. Brother Benedict. A
married man. (See Benedict.) Brother Birch. A
fellow-school-master. Brother Blade. A fellow-soldier,
properly; but now anyone of the same calling as yourself. Brother
Brush. A fellow-painter.
A fellow-tapster. Brother Buskin. A fellow-comedian or
actor. A Brother Chip. A fellow-carpenter.
A Brother Clergyman.
A fellow-clergyman. A Brother Crispin. A fellow-shoemaker.
A Brother Mason.
A fellow-Freemason. A Brother Quill. A fellow-author.
A Brother Salt.
A fellow-seaman or sailor. A Brother Shuttle. A
A Brother Stitch.
A fellow-tailor. A Brother String. A fellow-violinist.
A Brother Whip. A fellow coachman.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
More on Brother from Infoplease: