good/safe/sure bet
noun
                                
              
          
                                                      : a thing very likely to happen                                      
              
                             
It's a safe bet that they'll win.
                         
              
                                                       : someone or something most likely to do something successfully                                      
              
                             She's a good bet to win the tournament.
                         
                
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  Merriam-Webster unabridged




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