leatherneck (n.)youdaoicibaDictYouDict[leatherneck 词源字典]
"U.S. Marine," 1914, Navy slang, from leather + neck (n.). So called for the leather collars of their early uniforms; earlier in British use (1890) as a sailor's term for a soldier.[leatherneck etymology, leatherneck origin, 英语词源]