blue moon

blue moon

noun

Definition of BLUE MOON

1

: a very long period of time —usually used in the phrase once in a blue moon <such people happen along only once in a blue moon — Saturday Review>

2

: a second full moon in a calendar month

Examples of BLUE MOON

1. <once in a blue moon we'll get dressed up and eat in a fancy restaurant>

First Known Use of BLUE MOON

1821

Related to BLUE MOON

Synonyms: aeon (or eon), age, coon's age, cycle, donkey's years [chiefly British], eternity, forever, long, months, moon

Related Words: infinity; lifetime

Near Antonyms: flash, instant, jiffy, minute, moment, second, shake, split second, trice, twinkle, twinkling, wink; microsecond, nanosecond

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Rhymes with BLUE MOON

aswoon, attune, baboon, balloon, bassoon, buffoon, Calhoun, Cancún, cardoon, cartoon, cocoon, commune, doubloon, dragoon, festoon, fine-tune, forenoon, full moon, gaboon, gadroon, galloon, Gudrun, half-moon, harpoon, high noon, immune, impugn, jargoon, jejune, Kowloon, Kunlun, lagoon, lampoon, lardoon, Maine coon, maroon, monsoon, Neptune, new moon, oppugn, Pashtun, patroon, platoon, poltroon, pontoon, premune, puccoon, quadroon, ratoon, repugn, rough-hewn, saloon, Sassoon, shalloon, soupspoon, spittoon, spontoon, teaspoon, tribune, triune, tuchun, tycoon, typhoon, untune, Walloon