once in a purple moon

Meaning: (idiomatic)Extremelyrarely; almostnever.Synonyms:seeThesaurus:rarelyCoordinate term:once in a blue moon1924, New York Public Library,Dresses - Volumes 10-11, page15:However, in spite all of our complainings, there was a distinct pleasure in shopping along this street, becauseonce in a purple moon, one did strike a really nice model and so very reasonable, that one wondered how the manufacturer could afford to bring it out at the price.1988, Charles Reynell (publisher),The Economist, Volume 307, Issues 7544-7556, page11:Once in a purple moon, it may be necessary for the top men to settle some awful impasse between themselves.2012, Robert J. Kravitz,A Collectors Guide to Postage and Fractional Currency, page20:Again, these usually show up in major currency auctions, onlyonce in a purple moonwould a dealer have one in stock.

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