letters of marque
noun phrase
                                
              
          
                                                      : written authority granted to a private person by a government to seize the subjects of a foreign state or their goods                                      
                
                                
            specifically                
          
                                                      : a license granted to a private person to fit out an armed ship to plunder the enemy                                      
            
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  Merriam-Webster unabridged




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