The October 29, 1929, New York Stock Exchange crash is most closely associated with the nickname Black Tuesday.
On that day, about 16 million shares changed hands on the New York Stock Exchange, a record at the time, while the Dow Jones Industrial Average fell 11.73%. The selling followed the panic of Black Thursday, October 24, and Black Monday, October 28. Together, these sessions marked the most dramatic phase of the Wall Street Crash of 1929.
Black Tuesday did not instantly end the decline. The Dow continued to lose value over the next several years and reached its bear-market low in July 1932. The crash damaged confidence, reduced wealth, and contributed to a wider economic contraction that became the Great Depression.
A common mix-up is treating Black Tuesday as the sole day of the crash. In reality, the 1929 collapse was a sequence of violent trading sessions followed by a prolonged fall.