listen in
verb
            
              listened in; listening in; listens in            
        
    1
                    
                                          
              
          
                                                      : to tune in to or monitor a broadcast                                      
                
                    
2
                    
                                          
              
          
                                                      : to listen to a conversation without participating in it                                      
                
                                
            especially                
          
                                                      : eavesdrop                                      
            
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  Merriam-Webster unabridged




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