Definition of red-letter day in English:

red-letter day

Syllabification: red-let·ter day

noun

  • A day that is pleasantly noteworthy or memorable.
    More example sentences
    • Because feast days in such almanacs and calendars were frequently written or printed in red, a red-letter day came to be a term for one that was special.
    • Still, pub owners say, it was a red-letter day for business and they are planning a second block party for the first weekend of November.
    • Today, as I said, is a blue-ribbon day, a red-letter day, or whatever one wants to call it.

Origin

early 18th century: from the practice of highlighting a festival in red on a calendar.

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Word of the day grotesquerie
Pronunciation: grōˈteskərē
noun
grotesque quality or grotesque things collectively