letter of credit
noun phrase
1
                    
                                          
              
          
                                                      : a letter addressed by a banker to a correspondent certifying that a person named therein is entitled to draw on the writer's credit up to a certain sum                                      
                
                    
2
                    
                                          
              
          
                                                      : a letter addressed by a banker to a person to whom credit is given authorizing drafts on the issuing bank or on a bank in the person's country up to a certain sum and guaranteeing to accept the drafts if duly made                                      
                
                    
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  Merriam-Webster unabridged




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