One of the mysteries of the English language finally explained.
A supernatural being in the form of a calf, said to haunt the roads and countryside at night.
Mid 19th century; earliest use found in Chambers's Edinburgh Journal. Probably from rolling + calf, with reference either to the calf's wandering or to the sound made as it moves.
rolling calf/ˈrəʊlɪŋ ˌkɑːf/
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