chicken out
phrasal verb
            
              chickened out; chickening out; chickens out            
        
    
        informal      
      
                                
                                
              
          
                                                      : to decide not to do something because one is afraid                                      
              
                             
He was going to ask her on a date, but he chickened out at the last minute.
                         
                
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  Merriam-Webster unabridged




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