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once in a blue moon
01
used for saying that something can only happen on very rare occasions
What is the origin of the idiom "once in a blue moon" and when to use it?
The idiom "once in a blue moon" has its origins in astronomy and the lunar calendar. It became popular in the 19th century and the connection between the rare blue moon and the infrequent event led to the phrase being used to express rarity in general. This phrase can be applied to a wide range of scenarios, such as rare family gatherings, infrequent visits to a particular place, a seldom-seen natural phenomenon, or something that happens only on special occasions.
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Once in a blue moon, they attended a concert by their favorite band when they were in town.
Once in a blue moon, if the weather permits, they organize a neighborhood barbecue.
They visit their grandparents' farm once in a blue moon to reconnect with their rural roots.
Once in a blue moon, she treats herself to a spa day for some much-needed relaxation.
We went on a vacation together once in a blue moon, and it was a memorable experience.
