If something happens once in a blue moon, it happens rarely.
Example:
Dan: Hey, do you want some potato chips?
Frances: No thanks. I am very careful about what I eat. I eat junk food only once in a blue moon.
CUNY - College of Staten Island - English Language Institute
Monday, June 10, 2013
ONCE IN A BLUE MOON
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ELI,
english,
English in New York,
English Language Institute,
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esl phrases

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Thank you so much for explaining this idiom, it's always been my favorite since my childhood.
ReplyDeleteFreya, UK