An unbranded yearling. One Maverick owned large herds of cattle, some of which, escaping, were taken by his neighbours, branded, and called by his name.—John S. Farmer, ‘Americanisms,’ 1889.

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1887.  Nowadays you don’t dare to clap a brand on a mavorick [sic] even; and if they catch you altering a brand—hell! that’s a penitentiary job.—F. Francis, Jun., ‘Saddle and Moccasin,’ p. 172 (N.E.D.)

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