blue moon
noun
1
: a very long period of time
—usually used in the phrase once in a blue moon
such people happen along only once in a blue moon—
Saturday Rev.
Saturday Rev.2
: a second full moon in a calendar month
Examples of blue moon in a Sentence
once in a blue moon we'll get dressed up and eat in a fancy restaurant
Recent Examples on the Web
Their version of Superman was made with blue moon, red pop and lemon flavors.
—Jalen Williams, Detroit Free Press, 22 Dec. 2024
There's also a lot of supermoons in 2024 — four in a row, in fact, which began in August with a rare seasonal blue moon.
—John Tufts, The Courier-Journal, 4 Sep. 2024
On Monday, a super blue moon lit up the night sky, giving people a glimpse at this rare spectacle.
—Marley Malenfant, Austin American-Statesman, 20 Aug. 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
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Jalen Williams, Detroit Free Press, 22 Dec. 2024
There's also a lot of supermoons in 2024 — four in a row, in fact, which began in August with a rare seasonal blue moon.
—John Tufts, The Courier-Journal, 4 Sep. 2024
On Monday, a super blue moon lit up the night sky, giving people a glimpse at this rare spectacle.
—Marley Malenfant, Austin American-Statesman, 20 Aug. 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
Cite this Entry
“Blue moon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/blue%20moon. Accessed 30 Jun. 2025.
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