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• Black Hole of Calcutta (noun)
  1. 20 feet square a dungeon in a fort in Calcutta where as many as 146 English prisoners were held overnight by Siraj-ud-daula; the next morning only 23 were still alive
• Black Hole of Calcutta, the
  1. a small room used as a prison in Calcutta, India. In 1756, 146 British prisoners were put into it, and most of them died in one night. People sometimes say that a small very crowded room or dark place is "like the Black Hole of Calcutta".
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