blue moon

[bloo moon] / ˈblu ˈmun /

NOUN

long period of time

Synonyms

WEAK

ages forever and a day long time years

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.

Wright: Every blue moon, they would be in a good mood.

From Los Angeles Times • Apr. 16, 2025

Once in a blue moon, a person is willing to do the hard internal work that leads to real, sustainable change.

From Salon • Mar. 21, 2025

The full moon Aug. 19 will be both a supermoon and a blue moon.

From Los Angeles Times • Sep. 17, 2024

So the second full moon in a month becomes the blue moon.

From BBC • Aug. 19, 2024

Oh, I get it—it’s rare, like once in a blue moon.

From "Booked" by Kwame Alexander