Idioms title

The Idiom Attic - a collection of hundreds of English idioms, each one explained.

The meaning of "once in a blue moon"

" Once in a blue moon "
A rare occurrence.
West Bromwich Albion have won the cup. but only every once in a blue moon.
Where did it originate?:
Britain, 19th century.
Where is it used?:
Hear the idiom spoken:
More idioms about:   colour   nature   luck   number  

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