| Idiom | Once in a Blue Moon |
|---|---|
| Example | The teacher is tough, but once in a blue moon she doesn't give us homework. |
| Meaning | almost never; very seldom; hardly ever |
| Origin | On some nights when the bright part of the moon is a crescent, some people say the other part has a bluish color to it. This "blue moon" is rare. A similar expression was first used in the early 1500s and has been popular ever since. |
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