once in a blue moon

phrase

: very rarely

It happens once in a blue moon.

Examples of once in a blue moon in a Sentence

Recent Examples on the Web

Every once in a blue moon, a human being arrives on Earth as a freak accident of genetic alchemy, gifted with bone structure, height, and the uncanny positioning of features that registers to other humans as beauty. — Sophie Gilbert, The Atlantic, 6 Mar. 2026

In the world of esports female-only competitions are not exactly rare, but ones on this kind of scale only come around once in a blue moon. — Mike Stubbs, Forbes.com, 27 July 2025

But small things, such as finishing a pile of laundry, buying the best party decorations and only allowing children ice cream before dinner once in a blue moon, won't. — Faisal Kutty, Newsweek, 11 Mar. 2025

There's something to be said for that when most people slap a sheet of plastic on their phone and only remove it once in a blue moon. — Ryan Whitwam, Ars Technica, 24 Feb. 2025

Rhymes for once in a blue moon

• afternoon
• forenoon
• honeymoon
• importune
• laocoon
• opportune
• pantaloon
• picayune
• tablespoon
• attune
• baboon
• balloon