boiler room

noun
1.
a room in a building, ship, etc., that houses one or more steam boilers.
2.
Slang.
a.
a place where illicit brokers engage in high-pressure selling, over the telephone, of securities of a highly speculative nature or of dubious value.
b.
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.

boil·er-room, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
boiler room
 
n
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.  a.  a fraudulent scheme in which investors are encouraged to buy non-existent, worthless, or over-priced shares
 b.  (as modifier): a boiler-room scam

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Boiler room is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Example sentences
Cutoff switches should be close to the entry but outside of a boiler room.
The engineers are battling bravely to keep a flooding boiler room sealed off.
While walking back through the processing room you look into the door of the
  boiler room which leads into the processing room.
The two of them were found that night in the boiler room of a deserted
  tenement, their heads bashed in by bricks.
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