Black Friday
noun
Definition of Black Friday
US
: the Friday immediately following Thanksgiving Day that is considered by retailers to mark the beginning of the holiday shopping season ◆The origin of Black Friday in this sense is not known for certain. The day was allegedly so named either in reference to traffic congestion in central cities on the day after Thanksgiving or to the supposed fact that retailers' accounts shifted from red to black with the beginning of the shopping season.
From the M-W Editors
1961
First Known Use of black friday
1961
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