moxie (n.)

"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."