as in forever
a long or seemingly long period of time
once in a blue moon we'll get dressed up and eat in a fancy restaurant
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Recent Examples of blue moon
Black moons are referenced like blue moons, which are defined as the third full moon in an astronomical season containing four full moons.
—
Janet Loehrke, USA Today, 21 Aug. 2025
The August 2025 full moon is not a rare super blue moon.
—Tiffany Acosta, AZCentral.com, 2 Aug. 2025
This spectacle will have a window of ideal visibility through February 21.
March 14: Total lunar eclipse
Sometimes, full moons get called colorful names that are a bit of a fake-out: A blue moon isn’t really blue, and a pink moon isn’t really pink.
—Carlyn Kranking, Smithsonian Magazine, 30 Dec. 2024
Their version of Superman was made with blue moon, red pop and lemon flavors.
—Jalen Williams, Detroit Free Press, 22 Dec. 2024
See All Example Sentences for blue moon
Janet Loehrke, USA Today, 21 Aug. 2025
The August 2025 full moon is not a rare super blue moon.
—Tiffany Acosta, AZCentral.com, 2 Aug. 2025
This spectacle will have a window of ideal visibility through February 21.
March 14: Total lunar eclipse
Sometimes, full moons get called colorful names that are a bit of a fake-out: A blue moon isn’t really blue, and a pink moon isn’t really pink.
—Carlyn Kranking, Smithsonian Magazine, 30 Dec. 2024
Their version of Superman was made with blue moon, red pop and lemon flavors.
—Jalen Williams, Detroit Free Press, 22 Dec. 2024
See All Example Sentences for blue moon
Recent Examples of Synonyms for blue moon
Noun
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One way to mess with an option team’s Plan A is to not only stick them with third-and-forevers, but to put them in an early hole, making them throw out of desperation.—
Sean Keeler,
The Denver Post,
14 Sep. 2019
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Printed with thermochromic ink, the stamp reveals a second image of the moon when a finger is pressed to it, and a sheet of 16 Forever stamps features a map of the eclipse path.—
Meg Jones,
Milwaukee Journal Sentinel,
18 Aug. 2017
Noun
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And while Mamdani longs for a future of free Big Apple trips, riders will instead be getting slapped with price hikes in a matter of days.—
Alex Nitzberg,
FOXNews.com,
1 Jan. 2026
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The Frostys spread joy all year, providing happy sing-a-longs to seniors living in memory care communities.—
Karen Billing,
San Diego Union-Tribune,
24 Dec. 2025
Noun
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Nevertheless, the McAlarneys admit that keeping their children away from smartphones and limiting technology is easier said than done, especially in today’s digital age.—
Tereza Shkurtaj,
PEOPLE,
11 Jan. 2026
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From gentle cleansers to serums that tackle fine lines and wrinkles, all ages (even my 20-something self) would appreciate her picks.—
Kaitlin Clapinski,
InStyle,
11 Jan. 2026
Noun
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The automatic timepiece in a 40mm red gold case highlights calendar and moon phase functions, also in red gold, which stands out nicely against the sunburst blue dial, all on a navy exotic strap.—
Laurie Brookins,
HollywoodReporter,
12 Jan. 2026
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Hera will visit the asteroid Didymos and its moon Dimorphos as part of the NASA/ESA Asteroid Impact and Deflection Assessment (AIDA) collaboration.—
Richard Tribou,
The Orlando Sentinel,
12 Jan. 2026
Cite this Entry
“Blue moon.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/blue%20moon. Accessed 16 Jan. 2026.
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