boiler room
noun
1
                    
                                          
              
          
                                                      : a room in which a boiler is located                                      
                
                    
2
                    
                                          
              
          
                                                      : a room equipped with telephones used for making high-pressure usually fraudulent sales pitches                                      
                
                    
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  Merriam-Webster unabridged




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