kissing cousin
noun
1
                    
                                          
              
          
                                                      : one that is closely related in kind to something else                                      
                
                    
2
                    
                                          
              
          
                                                      : a person and especially a relative whom one knows well enough to kiss more or less formally upon meeting                                      
                
                    
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  Merriam-Webster unabridged




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