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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