극복해야 할까1 [이디엄] once in a blue moon 매우 드물게 once in a blue moon Meaning very rarely once after a long time something that happens very seldom on rare occasions almost never hardly ever Example Sentences The earthquakes hits once in a blue moon in this part of the earth, we never felt it. I don’t know why she bought that music system – she uses it once in a blue moon. “I think my grandson doesn’t love me anymore, he comes to see me only on.. 2021. 9. 21. 이전 1 다음