on a first-name basis
idiom
        US      
      
                                
                                
              
          
                                                      : having a close personal relationship where each person addresses the other by their first name                                      
              
                             
He was on a first-name basis with his boss.
                                       They know most of the officials on a first-name basis.
                         
                
                  —sometimes used figuratively to describe something that one is familiar with or accustomed toShe was on a first-name basis with adversity.
    
                
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  Merriam-Webster unabridged




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