root (someone or something) on
phrasal verb
            
              rooted on; rooting on; roots (someone or something) on            
        
    
        US      
      
                                
                                
              
          
                                                      : to help (someone or something) to win or succeed by expressing or showing strong support                                      
              
                             
Thousands of fans were there to root the team on.
                         
                
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  Merriam-Webster unabridged




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