Once in a Blue Moon

What it means

Rarely enough that you stop expecting it between one time and the next.

Where it comes from

The now standard definition, a second full moon in one calendar month, comes from a magazine article of 1946 that misread an old almanac. The mistake was repeated until it became the rule.

The puzzle it came from

Once in a Blue Moon was the answer to the Phrasicle of September 30, 2025. The clue read Once in a ____ ____, and the words came out of a grid where every neighbouring pair makes a two-word phrase.

Play today's Phrasicle Play the September 30, 2025 puzzle

Phrases like this one

• Out of the Blue