vulgar substitution
noun
                                                                                                                            
                                                            vul·gar substitution
                    
                                                                                                              
                                                                                                                              
            ˈvəl-gər-
                                                      
                                                          
                      in the civil law of Louisiana 
                                  
              
          
                                                      : a testamentary disposition in which the person making the will names another person to take the gift in the event that the instituted heir does not accept it or is already deceased                                      
                
                    
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  Merriam-Webster unabridged




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