Black Friday
US /ˌblæk ˈfraɪ.deɪ/
UK /ˌblæk ˈfraɪ.deɪ/

1.
the day after Thanksgiving, regarded as the first day of the Christmas shopping season, on which retailers make many special offers.
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Many stores open early on Black Friday to offer huge discounts.
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Are you planning to shop on Black Friday this year?