Once in a blue moon
English Idiom
Meaning: This idiom refers to something that happens very rarely. It's used to describe events or actions that occur infrequently and are often unexpected.
Origin: The idiom 'once in a blue moon' originates from a rare astronomical event where a second full moon appears within the same calendar month. This phenomenon happens roughly every two to three years, which is why it is used to describe something that occurs infrequently.
Examples
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She only visits her hometown once in a blue moon, preferring to spend her vacations abroad.
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John checks his email once in a blue moon, so it's better to call him if you need a quick response.
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The old clock in the hallway chimes correctly only once in a blue moon.
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Once in a blue moon, the company offers a flash sale, attracting a swarm of eager shoppers.
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He engages in small talk once in a blue moon, usually preferring to stay focused on work.
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The team wins a game once in a blue moon, making each victory a cause for celebration.
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She bakes cookies once in a blue moon, but when she does, they are absolutely delicious.
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The author releases a new book once in a blue moon, keeping his fans eagerly waiting.
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Once in a blue moon, the city hosts a free concert in the park, drawing crowds from all over.
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He goes on a fishing trip once in a blue moon, usually when he needs a break from his hectic schedule.