Definition of Black Thursday in English:

Black Thursday

Syllabification: Black Thurs·day

noun

October 24, 1929. On this date, a then-record number of shares were traded on the New York Stock Exchange by panicked investors, marking the onset of the stock market crash that precipitated the Great Depression.

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Word of the day hubris
Pronunciation: ˈ(h)yo͞obris
noun
excessive pride or self-confidence