once in a blue moon


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once in a blue moon

Occasionally; very rarely. Peter only comes out for a drink once in blue moon now that he has kids. A: "Do you ever eat pork?" B: "Only once in a blue moon; I prefer beef."
See also: blue, moon, once

once in a blue moon

Cliché very seldom. Jill: Does your husband ever bring you flowers? Ellen: Once in a blue moon. Once in a blue moon, I buy a fashion magazine, just to see what people are wearing.
See also: blue, moon, once

once in a blue moon

Rarely, once in a very long time, as in We only see our daughter once in a blue moon. This term is something of a misnomer, because an actual blue moon-that is, the appearance of a second full moon in the same calendar month-occurs every 32 months or so. Further, the moon can appear blue in color at any time, depending on weather conditions. [Early 1800s]
See also: blue, moon, once

once in a blue moon

If something happens once in a blue moon is happens only very rarely. I only get over to Cambridge once in a blue moon and I'm never in London. Only once in a blue moon do properties of this quality become available. Note: In some places, if there are two full moons in a calendar month, the second is called a `blue moon'. This is rare.
See also: blue, moon, once

once in a blue moon

very rarely; practically never. informal
The colour blue was an arbitrary choice in this phrase. To say that the moon is blue is recorded in the 16th century as a way of indicating that something could not be true.
See also: blue, moon, once

ˌonce in a blue ˈmoon

(informal) very rarely: Sue’s daughter only visits her once in a blue moon.
See also: blue, moon, once

once in a blue moon

mod. rarely. Once in a blue moon I have a little wine with dinner.
See also: blue, moon, once