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'Once in a blue moon' means

AEvery day
BVery rarely
COn full moon nights
DEvery blue moon party
Answer & Solution
Correct answer: B. Very rarely
1. A 'blue moon' is a rare lunar event. 2. Idiom denotes extreme rarity. 3. Every day is the opposite. 4. Hence option A. _Source: jkchrome.com SSC Idioms and Phrases PDF (Mistral OCR), section on common idioms_
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