on the scent of
idiom
                                
              
          
                                                      : following (an animal or person) by sensing the animal's or person's smell                                      
              
                             
The dogs was on the scent of a fox.
                         
                
                  —often used figurativelyThe reporter was on the scent of a big story.
    
                
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  Merriam-Webster unabridged




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