Once in a blue moon.
/wʌns ɪn ə bluː muːn/
Once in a blue moon.
/wʌns ɪn ə bluː muːn/
Once in a blue moon" means something happens very rarely, much like the rarity of a second full moon appearing in a single calendar month, which is an unusual event. This idiom encourages appreciation for the infrequent and extraordinary events in life. It's a reminder that not all occurrences are common and that some moments should be cherished because of their rarity. This can inspire individuals to take advantage of rare opportunities when they arise.
He visits us once in a blue moon.
He rarely visits us.
I only eat fast food once in a blue moon.
He seldom eats fast food.
She thinks of calling her old friends only once in a blue moon.
She rarely thinks of calling her old friends.