red-letter

American  

[red-let-er] / ˈrɛdˈlɛt ər /

adjective

1. marked by red letters, as festival days in the church calendar.

2. memorable; especially important or happy.

   a red-letter day in his life.

3. (of a Bible) having the quoted words of Jesus appear in red type.

   a red-letter edition;

   the red-letter New Testament presented at her baptism.

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Etymology

Origin of red-letter

First recorded in 1660–70

Example Sentences

His 24 points - his highest tally in a Test match - included two tries, but his kicking, vision and communicative skills laid the foundation for Ireland's red-letter day.

From BBC • Sep. 10, 2023

Saturday was a red-letter day for the history of art in Southern California.

From Los Angeles Times • Jun. 21, 2022

“The eventual purchaser will be able to steward them into publication, which will be a red-letter day for Brontë scholarship,” he said.

From Seattle Times • Mar. 30, 2022

Normally he was a jovial man, with an impish sense of humor, but on that red-letter day he was clearly bummed.

From Washington Post • Mar. 29, 2022

It was a red-letter day, after all, so I put aside the black ink and held up the bottle of red.

From "The Evolution of Calpurnia Tate" by Jacqueline Kelly