Black Monday
n.— «Many have taken to calling the benchmark “Black Monday”—piggybacking on “Black Friday,” the longtime nickname of the day after Thanksgiving, historically the day when sales pushed money-losing stores into the black.» —“Web merchants gear up for busy ‘Black Monday’” by Mylene Mangalindan Post-Gazette (Pittsburgh, Pa.) Nov. 21, 2005. (source: Double-Tongued Dictionary)
Further reading
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There are eight major planets, but more than a million minor ones, including asteroids. If you discover one, you get the honor of naming it. The Dictionary of Minor Planet Names includes minor planets named for rock bands, jazz musicians, poets, and...