noun
a French term meaning 'affair of honor' or 'duel', typically referring to a formal combat between two people to settle a dispute
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The two gentlemen decided to settle their dispute with an affaire d'honneur.
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The guys were old school, so they went for an affaire d'honneur to sort things out.
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Those dudes were so mad at each other, they went for an affaire d'honneur.
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Their debate turned into an affaire d'honneur, with each side fiercely defending their position.