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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Janson Junk would be a logical option as a long-reliever, as well.—
Jordan McPherson,
Miami Herald,
11 Feb. 2026
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The narrator cries, rages, longs for the living body and the lively boy, and obsesses over painful details, especially the bleak journey by sea that brought the remains of his beloved friend back home.—
Kathryn Schulz,
New Yorker,
9 Feb. 2026
Noun
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The country’s relatively high draft age and the exemption of the youngest draftees from the frontlines means the average age of a Ukrainian soldier is about 43 years, significantly older than in many western countries.—
Ivana Kottasová,
CNN Money,
22 Feb. 2026
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Plus, taking out funds before age 59½ could trigger a 10% penalty, with some exceptions, said Collado, who is also a certified public accountant and a member of CNBC's Financial Advisor Council.—
Jessica Dickler,Kate Dore, CFP®, EA,
CNBC,
21 Feb. 2026
Noun
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But the Apollo samples pointed to a novel theory about how Earth acquired such a big moon, Crow said.—
Ashley Strickland,
CNN Money,
21 Feb. 2026
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One of the most exciting missions to ever journey to the outer solar system has the be the Dragonfly multi-rotor helicopter that will head to Saturn's moon Titan in 2028.—
Space.com Staff,
Space.com,
21 Feb. 2026
Cite this Entry
“Blue moon.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/blue%20moon. Accessed 22 Feb. 2026.
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