boiler room

noun

1. a room in a building, ship, etc., that houses one or more steam boilers.
2. Slang.
   1. a place where illicit brokers engage in high-pressure selling, over the telephone, of securities of a highly speculative nature or of dubious value.
   2. any room or business where salespeople, bill collectors, solicitors for charitable donations, etc., conduct an intensive telephone campaign, especially in a fast-talking or intimidating manner.

noun

1. any room in a building (often in the basement) that contains a boiler for central heating, etc
2. the part of a steam ship that houses the boilers and furnaces
3. the room or department in which the real work of an organization goes on unseen
4. (chiefly US) an office used by a team of telephone salespeople, esp of stocks and shares, operating under high pressure
5. 1. a fraudulent scheme in which investors are encouraged to buy non-existent, worthless, or over-priced shares
   2. (as modifier)a boiler-room scam