red-letter day

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

SpaceX’s big news, along with Anthropic’s showing potential to turn a profit far sooner than expected and OpenAI’s prepping for its public debut, made yesterday AI’s red-letter day.

From The Wall Street Journal • May 21, 2026

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

Could Feb. 15 be a red-letter day for Nikki Haley?

From Washington Times • Feb. 7, 2023

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

From Los Angeles Times • Jun. 21, 2022

But it had been a red-letter day anyhow, the main day of the year for me, better than the 4th of July.

From "The Teacher’s Funeral" by Richard Peck