Black Tuesday October 29, 1929, when the DJIA fell 12% - one of the largest one-day drops in stock market history. More than 16 million shares were traded in a panic selloff. Investopedia Says: By many, Black Tuesday is considered the end of the Roaring '20s and the start of the Great Depression. Related Terms: Black Friday Black Monday Calendar Effect Crash Great Depression Panic Selling Speculator Take a Bath Trading Halt |