The phrase "fit as a flea" is a variation of the older phrase "fit as a fiddle," which originated in the 17th century. The comparison to a flea suggests a small and agile creature that is known for its energetic and active nature. It is used to describe someone who is in excellent physical health, vitality, and overall condition.

What is the origin of the idiom "fit as a flea" and when to use it?

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英語での「(as) fit as a flea」の定義と意味

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