noun
a government license that allows a private person to attack and capture enemy vessels during wartime
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During times of war, privateers were authorized to attack enemy ships with letters of marque.
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Back in the day, privateers used to sail the seas with letters of marque to plunder enemy vessels.
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Yo ho ho! With those letters of marque in hand, we be free to pillage and plunder as we please!
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In the business world, having a strong legal team is like having letters of marque to protect your interests.