Question : Select the most appropriate meaning of the given idiom.
Once in a blue moon
Option 1: Very ancient
Option 2: Very colorful
Option 3: Very rare
Option 4: Very high
Correct Answer: Very rare
Solution : The correct choice is the third option.
This idiom is used to describe something that happens very infrequently or rarely , similar to how often a blue moon occurs after thirty-three months.
Therefore, the most appropriate meaning of the idiom, once in a blue moon is very rare.
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