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
Super blue moons can also occur, but don’t be fooled by the name.
—
Callum Sutherland, Time, 6 Oct. 2025
But sometimes, once in a magical blue moon, a star will stray from the norm—and pop up in the most random of places.
—Christian Allaire, Vogue, 18 Sep. 2025
But a blue moon isn’t supposed to last for a year.
—Brett Owens, Forbes.com, 1 Sep. 2025
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
See All Example Sentences for blue moon
Callum Sutherland, Time, 6 Oct. 2025
But sometimes, once in a magical blue moon, a star will stray from the norm—and pop up in the most random of places.
—Christian Allaire, Vogue, 18 Sep. 2025
But a blue moon isn’t supposed to last for a year.
—Brett Owens, Forbes.com, 1 Sep. 2025
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
See All Example Sentences for blue moon
Recent Examples of Synonyms for blue moon
Noun
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Those tush-pushes can’t beat you if The Winter Soldier’s facing third-and-forevers.—
Joe Nguyen,
Denver Post,
17 Jan. 2026
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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
Noun
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Selling programs have been relentless in the S & P 500, as many of these algorithmic systems look to push ranges (both lower and higher), flushing weak longs out of the market.—
Jeff Kilburg,
CNBC,
6 Mar. 2026
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The 383-mile-long river runs along the borders between Washington, Maryland, Virginia and West Virginia.—
Rebecca Morin,
USA Today,
18 Feb. 2026
Noun
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An 11-year-old girl was fatally shot at a playground in Cincinnati's West End, the second child of that age killed in the block since 2023.—
Cameron Knight,
Cincinnati Enquirer,
8 Mar. 2026
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Payments largely depend on a recipient’s retirement age.—
Asher Notheis,
The Washington Examiner,
8 Mar. 2026
Noun
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The peak falls near a first-quarter moon this year, which bodes well for another bright, impressive shower this year, per the Old Farmer’s Almanac.—
Joseph Erbentraut,
Better Homes & Gardens,
7 Mar. 2026
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The contrast between this matte dark green and the subtle sparkly gold half moons is really pretty.—
Kara Jillian Brown,
InStyle,
7 Mar. 2026
Cite this Entry
“Blue moon.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/blue%20moon. Accessed 14 Mar. 2026.
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