that will/should do it
idiom
1
                    
                                          
              
            
                  —used in informal speech to tell someone that one does not want or need anything more
"Would you like anything else?" "No, that'll do it."
                  —sometimes shortened to that will/should doThat should do, thanks.
    
                
                    2
                    
                                          
              
            
                  —used to say that one has finished doing something or is about to finish doing something.
I just have one more letter to sign and that should do it.
    
                
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  Merriam-Webster unabridged




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