What nickname was given to the October 24, 1929 stock-market collapse?

The October 24, 1929 stock-market collapse was nicknamed Black Thursday.

On that Thursday, panic selling produced exceptionally heavy trading on the New York Stock Exchange. The Dow Jones Industrial Average fell sharply, although a group of major bankers later attempted to stabilize prices by buying selected shares.

The temporary recovery did not end the crisis. The Dow declined again on October 28, known as Black Monday, and suffered an even more severe fall on October 29, known as Black Tuesday. Those dates are part of the same 1929 crash sequence, not separate unrelated crashes.

Black Thursday helped destroy confidence in the idea that prices would continue rising indefinitely. The market’s decline continued after October and reached a much lower point in 1932. The broader economic depression involved banking, employment, production and international trade, so the nickname describes a market day rather than the entire Great Depression.