noun
A slang term for a United States Marine, derived from the term 'Leatherneck'
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The gyrene exhibited exceptional discipline and leadership during the military training exercise.
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Hey, did you hear that the new guy in our squad is a gyrene?
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I heard that gyrenes always have each other's backs in tough situations.
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Being a gyrene in the corporate world means always being prepared for any challenge that comes your way.