Black Friday. Any Friday on which a public disaster has occurred, as: In England, December 6, 1745, when the news of the landing of the Pretender reached London, or May 11, 1866, when a financial panic commenced. In the United States, September 24, 1869, and September 18, 1873, on which financial panics began, and especially October 29, 1929, when a dramatic drop in stock prices contributed to the factors which began the great depression of the 1930's.
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