___ in a blue moon
The crossword clue "___ in a blue moon" is answered by ONCE, a 4-letter entry. Used 53 times across 19 distinct years; most recently in 2026; first recorded in 1997. It appears in 15 publications in the xd corpus.
The answer
ONCE
4 letters. See every clue for this answer on the ONCE answer page.
Used 53 times across 19 distinct years; most recently in 2026; first recorded in 1997. It appears in 15 publications in the xd corpus. Frequency and last-seen figures come from the xd crossword corpus only.
Other clues for ONCE
Every other clue in this collection answered by ONCE, most used first.
- Formerly - used 402 times, most recently in 2026
- A single time - used 296 times, most recently in 2026
- "__ upon a time..." - used 138 times, most recently in 2026
- As soon as - used 137 times, most recently in 2026
- Fairy tale starter - used 66 times, most recently in 2026
- Fairy tale opener - used 59 times, most recently in 2026
- Fairy tale beginning - used 54 times, most recently in 2026
- Fairy tale start - used 49 times, most recently in 2026
Related clues
Clues in this collection of the same answer length that share a word with this clue, or match its answer pattern when no word is shared. Most used first.
- Blue-pencil - EDIT, used 151 times
- Blue dye - ANIL, used 116 times
- Morales of "NYPD Blue" - ESAI, used 104 times
- Half-moon tide - NEAP, used 62 times
- Blue-green - TEAL, used 61 times
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