1829, in pugilism, agent noun from stun. Meaning "beautiful woman" attested by 1848 on notion of "one who astounds or amazes."
1660s, "dazzling," present-participle adjective from stun (v.). Popularized for "splendid, excellent" c. 1849. Related: Stunningly.
"revolver," 1904, slang shortening of Gatling gun; by 1880, gatlin was slang for a gun of any sort.
type of machine gun used by the British army in World War II, 1937, short for Bren gun, coined from first letters of Brno, Czechoslovakia, and Enfield, near London. The patent was purchased in Brno, and the gun was manufactured in Enfield.
1752, of a gun, "to fail in firing;" by 1893 of an internal combustion engine; see mis- (1) "badly, wrongly" + fire (v.). Perhaps the first element is miss (v.); to miss fire, of a gun, is attested by 1727. Related: Misfired; misfiring. Figurative use by 1942. The noun is attested from 1839 in reference to a gun or cannon.