sotto voce
adverb or adjective
                                                                                                                            
                                                            sot·to vo·ce
                    
                                                                                                              
                                                                                                                                  ˌsä-tō-ˈvō-chē 
                                                      
                                                          
            1
                    
                                          
              
          
                                                      : under the breath : in an undertone                                      
                
                                
            also                
          
                                                      : in a private manner                                      
            
            2
                    
                                          
              
          
                                                      : very softly                                      
                
                  —used as a direction in music
    
                
                    
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  Merriam-Webster unabridged




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