One of the mysteries of the English language finally explained.
1A mouse which lives in the countryside (originally as a character in fables).
2(Frequently with allusion to one of Aesop's fables) a country dweller, especially one who is unfamiliar with urban life.
Mid 16th century. After classical Latin rusticus mūs (Horace), ancient Greek μῦς ἀρουραῖος (Aesop).
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