One of the mysteries of the English language finally explained.
A North American wood warbler, Vermivora ruficapilla (family Parulidae), with an olive-green back, grey head, and yellow underparts.
Early 19th century; earliest use found in Alexander Wilson (1766–1813), ornithologist and poet. From the name of Nashville + warbler.
Nashville warbler/ˈnaʃvɪl ˈwɔːblə/
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