nest egg
noun
1
                    
                                          
              
          
                                                      : a natural or artificial egg left in a nest especially to induce a hen to continue to lay there                                      
                
                    
2
                    
                                          
              
          
                                                      : a fund of money accumulated as a reserve                                      
                
                    
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  Merriam-Webster unabridged




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