black friday
Frequency: 4.84 in modern English
Meaning
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Any Friday that is literally or figuratively darkened by catastrophe, or the anniversary thereof.
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The conclusion of United States v. Scheinberg on April 15, 2011, after which major online poker sites stopped offering real money play to their United States customers.
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The day after Thanksgiving Day, generally regarded as the first day of the Christmas season, and the busiest shopping day of the year.
Canadian usage; British usage; American usage
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The sales period involving heavy price reductions immediately following Thanksgiving Day, from Friday (the original Black Friday) through Monday (Cyber Monday).
American usage
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Synonym of Friday the thirteenth (“a Friday falling on the 13th day of the month (and therefore doubly ill-omened)”).