Tìm kiếm
Chọn ngôn ngữ của từ điển
once in a blue moon
01
used for saying that something can only happen on very rare occasions
Idiom
Informal
Các ví dụ
Once in a blue moon, she treats herself to a spa day for some much-needed relaxation.
They visit their grandparents' farm once in a blue moon to reconnect with their rural roots.
