"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.
权威例句
1. A leatherneck or a grunt do not names to call someone.
海军陆战队员(leatherneck)和美国步兵(grunt)都不是对他人的合适称呼.
2. I did not know his nephew Jack became a leatherneck.