the tube
noun
1
                    
                                US,  informal 
                                  
              
          
                                                      : the television                                      
              
                             
What's on the tube tonight?
                         
                
                    2
                    
                                British 
                                  
              
          
                                                      : the system of trains that run underground in London                                      
                
                    
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  Merriam-Webster unabridged




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