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"courage," 1930, from Moxie, brand name of a bitter, non-alcoholic drink, 1885, perhaps as far back as 1876 as the name of a patent medicine advertised to "build up your nerve;" despite legendary origin stories put out by the company that made it, it is perhaps ultimately from a New England Indian word (it figures in river and lake names in Maine, where it is apparently from Abenaki and means "dark water"). Much-imitated in its day; in 1917 the Moxie Company won an infringement suit against a competitor's beverage marketed as "Proxie."
[1908+; the semantic history is not entirely clear; best known fr the advertising slogan ''What this country needs is plenty of Moxie,'' used for a brand of soft drink registered in 1924; but other Moxie drinks preexisted this: a patent ''nerve medicine'' of the same name was marketed in 1876; the name may be based on a New England Indian term found in several Maine place names and perhaps in the name of a plant, moxie-berry]