"Once ___ blue moon" NYT crossword answer is:INA (3 letters length)
The answer for "Once ___ blue moon" crossword clue is listed above to help you solve the puzzle you are currently working on.
Once in a blue moon is an idiom that is used to describe a rare occurrence. It is derived from the fact that a full moon appears blue in color only once every two to three years. This phrase is often used to describe something that is unlikely to happen or something that is very special. It is also used to describe a moment that is unique and special, such as a once in a lifetime opportunity.