From Longman Dictionary of Contemporary Englishbroncobron‧co /ˈbrɒŋkəʊ $ ˈbrɑːŋkoʊ/ noun (plural broncos) [countable] HBAa wild horse from the western US a bucking bronco
Examples from the Corpus
bronco• It is like riding a bucking bronco.• Mow alfalfa and bundle it in bales, shear sheep, bust broncos.Origin bronco (1800-1900) Mexican Spanish Spanish, “rough, wild” 