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   Red-let·ter day

   /ˌred ˈledər ˌdā/

   

   noun

   • 1. a day that is pleasantly noteworthy or memorable: "the end of the financial year used to be a red-letter day for investors"

   Word Origin mid 17th century (denoting a saint's day): from the practice of highlighting a festival in red on a calendar.

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