retighten
verb
                                                                                                                            
                                                            re·tight·en
                    
                                                                                                              
                                                                                                                                  (ˌ)rē-ˈtī-tᵊn 
                                                      
                                                          
            
            
              retightened; retightening            
        
    
                                
              
          
                                                      : to make (something) tight or tighter again                                      
              
                             
Retighten the screws.
                                       He retightened his belt/grip.
                         
                
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  Merriam-Webster unabridged




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