noun
A slang term for a member of the United States Marine Corps, derived from the leather collar once part of the Marine Corps uniform
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The Leatherneck division is known for its outstanding performance in combat.
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My grandpa used to be a Leatherneck in the Marines.
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I heard that guy is a real Leatherneck, always ready for a fight.
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She's a Leatherneck when it comes to negotiating deals, never backing down.