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

This was a red-letter day for Adelaide-born Head as he scored a stunning century in front of a packed crowd on familiar territory.

From BBC • Dec. 7, 2024

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

From Los Angeles Times • Jun. 21, 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 for Elizebeth, proof that she had lived up to her old dreams of achievement.

From "The Woman All Spies Fear" by Amy Butler Greenfield