once in a blue moon Meaning in Cambridge American English Dictionary
Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

Meaning of "once in a blue moon" - American English Dictionary

See all translations

once in a blue moon

rarely: Once in a blue moon he’d call, but for months at a time we heard nothing.
Translations of “once in a blue moon”
in Chinese (Traditional) 少有地…
in Russian раз в год по обещанию, очень редко…
in Turkish ayda yılda bir, kırk yılda bir, (argo) ölme eşeğim ölme…
in Chinese (Simplified) 少有地…
in Polish raz na ruski rok…
(Definition of once in a blue moon from the Cambridge Academic Content Dictionary © Cambridge University Press)
Add Cambridge dictionaries to your browser to your website

Definitions of “once in a blue moon” in other dictionaries

Word of the Day
sprint

a short and very fast race, such as the 100 metres, or the last part of a longer race that is run as fast as possible

Word of the Day

Are you a glass-half-full person? (Everyday Idioms)
Are you a glass-half-full person? (Everyday Idioms)
by Kate Woodford,
July 29, 2015
A reader of this blog recently asked for a post on idioms that are used in everyday English. This seemed like a reasonable request. After all, if you are going to make the effort to learn a set of English idioms, you want those idioms to be useful. The question, then, was

Read More 

exoskeleton noun
exoskeleton noun
July 27, 2015
a robotic device which goes around the legs and part of the body of a person who cannot walk and allows them to move independently and in an upright position The device, known as an exoskeleton, is strapped to the outside of a person’s limbs and can then be controlled by them.

Read More