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Meaning of baron of beef

bar'on of beef'

Pronunciation: [key]
— Chiefly Brit. Chiefly Brit.
  1. a joint of beef consisting of the two sirloins joined at the backbone; double sirloin. Cf. baron (def. 4).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.