English Idioms: Once in a blue moon

Learn how to use “Once in a blue moon” English Idiom.

The phrase “once in a blue moon” is used to describe something that happens very rarely or infrequently.

For example, if someone says, “I only eat fast food once in a blue moon,” it means they almost never eat it. This idiom can be used in casual conversations to emphasize the rarity of an event, such as, “She visits her hometown once in a blue moon,” meaning she hardly ever goes back. It adds a sense of exaggeration and emphasis to convey how uncommon something is.

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History of “Once in a Blue Moon”

The origin of “once in a blue moon” dates back to the 16th century, when it was used to describe something absurd or impossible. The term “blue moon” later became associated with an astronomical event where a second full moon occurs within a single calendar month, which happens roughly every two to three years.

Over time, the phrase evolved to mean something that occurs very rarely, even though a blue moon is not as rare as the saying suggests. The idiom has remained popular in English for centuries, often used to describe events or habits that are highly uncommon.

5 Example English Sentences using the idiom “once in a blue moon”

1. I love chocolate, but I only eat it once in a blue moon to stay healthy.

2. We used to go hiking every weekend, but now we only do it once in a blue moon.

3. He cleans his room once in a blue moon, so it’s always messy.

4. My grandparents live far away, so I see them once in a blue moon.

5. She buys designer clothes once in a blue moon because they are so expensive.

 

I hope you learned how to use the phrase once in a blue moon and understand its meaning better.

This idiom is a great way to express how rarely something happens in a fun and colorful way. Try using it in your conversations or writing to make your English sound more natural. If you have any questions or want to share your own example sentences, feel free to leave a comment on my YouTube Channel! Don’t forget to subscribe for TONS of English content.

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Camille Hanson

Hi friends! I'm Camille. I create engaging American English content for ESL people around the world. When I am not creating videos, books or blogs, you will probably find me in a cafe somewhere around the world, studying my next target language or at home cooking up food for my family of five. Stick around, read some posts and learn some English with me :) Tchau, ciao! ~Camille
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