live on (something)
idiom
1
                    
                                          
              
          
                                                      : to have or use (an amount of money) to pay for the things that one needs to live                                      
              
                             
You can't live on this salary.
                         
                
                    2
                    
                                          
              
          
                                                      : to have (a particular food) as the only or main food that one eats                                      
              
                             
They lived mainly/mostly on fruits and berries.
                         
                
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  Merriam-Webster unabridged




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