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.

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

Despite being called a blue moon, the moon doesn't actually turn blue.

From BBC • Aug. 19, 2024

Now, celestial enthusiasts can look forward to seeing a super blue moon this week starting Monday.

From Los Angeles Times • Aug. 19, 2024

“Not once in a blue moon, or a month of Sundays.”

From "The Graveyard Book" by Neil Gaiman