The AI-powered English dictionary
plural leathernecks
(slang) A soldier.
(US) Specifically, a marine. quotations examples
The Marine Corps has instituted a martial-arts program in which leathernecks are indoctrinated in a new code of honor, the Ethical Marine Warrior.
2011, Steven Pinker, The Better Angels of Our Nature, Penguin, published 2012, page 318