tell apart
phrasal verb
            
              told apart; telling apart; tells apart            
        
    
                                
              
          
                                                      : to see what the differences are between (people or things) : to identify (people or things that look similar to each other)                                      
              
                             
It's hard to tell the twins apart.
                         
                
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  Merriam-Webster unabridged




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