Definition of black hole of calcutta in English English dictionary
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
a dungeon (20 feet square) 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