knock the stuffing out of
idiom
        informal      
      
                                
                                
              
          
                                                      : to cause (someone) to lose energy and confidence : to make (someone) feel weak or overwhelmed                                      
              
                             
When he found out that he didn't get the job, it really knocked the stuffing out of him.
                         
                
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  Merriam-Webster unabridged




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