once in a blue moon
idiomE

An event or action that happens very rarely or infrequently
  • 1I only see my cousins once in a blue moon.
  • 2He visits the museum once in a blue moon.
Imagine something that almost never happens, like seeing a blue moon. That's how rare something is when it happens "once in a blue moon." It's like a special event that you hardly ever get to see or experience.
Card
Remember, "once in a blue moon" is not just about the color of the moon. It's about how rare the event is. So focus on the rarity, not the color!
at a relaxation center
A Rare Pampering
Edward
I can't believe you finally made it here, Sandra!
Sandra
I know, right? I only get a chance to relax like this once in a blue moon.
Edward
Well, I'm glad you're here now. It's a perfect day for it.
Sandra
Absolutely, let's make the most of it!
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Similar to "once in a blue moon":
  • 1rarely
  • 2seldom
  • 3hardly ever