Red-letter-day meaning

(idiomatic) A particularly significant day or a day to celebrate (personal or sectarian).

Monday was a red letter day for her. She accomplished a lot and had fun doing it.

We saw losses for the days in a row, but Black Tuesday was the worst red letter day of them all.

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Alternative form of red letter day.
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Origin of red-letter-day

  • From the practice of marking feast-days in red on church calendars.

    From Wiktionary