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.

Визначення та значення слова «(as) fit as a flea» англійською мовою

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