shell game
noun
1
                    
                                          
              
          
                                                      : thimblerig played especially with three walnut shells                                      
                
                    
2
                    
                                          
              
          
                                                      : fraud                                      
                
                                
            especially                
          
                                                      : a swindle involving the substitution of something of little or no value for a valuable item                                      
            
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  Merriam-Webster unabridged




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