bottle up
phrasal verb
            
              bottled up; bottling up; bottles up            
        
    
                                
              
          
                                                      : to keep (a feeling or emotion) inside instead of expressing it : to hide (a feeling or emotion)                                      
              
                             
She's kept her feelings about the accident bottled up for too long.
                                       I know he's angry, but he bottles it up inside instead of talking to someone about it.
                         
                
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  Merriam-Webster unabridged




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