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English word mustang comes from Spanish mestengo ((Mexican) A wild or feral animal.)
mestengo (Spanish)
(Mexican) A wild or feral animal.
mustang (English)
(U.S., military slang) A merchant marine who joined the U.S. Navy as a commissioned officer during the American Civil War.. (U.S., military slang, generalized) A commissioned officer who started military service as an enlisted person.. A small, hardy, naturalized (feral) horse of the North American west.