B1idiom
Once in a blue moon
아주 드물게 (매우 가끔 일어나는 일)
Something that happens very rarely.
예문
He calls me once in a blue moon.
We meet once in a blue moon these days.
아주 드물게 (매우 가끔 일어나는 일)
Something that happens very rarely.
He calls me once in a blue moon.
We meet once in a blue moon these days.