Definition of Black Monday in English:

Black Monday

Syllabification: Black Mon·day

noun

Monday, October 19, 1987. On this date, the collapse of stock prices on Wall Street triggered similar declines in markets around the world.

Definition of Black Monday in:

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Word of the day demoralize
Pronunciation: dɪˈmɒrəlʌɪz
verb
cause (someone) to lose confidence or hope