fit as a flea

idiom

Definition of fit as a flea

informal, British
: in good physical condition : very healthy and strong I feel (as) fit as a flea this morning.

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“Fit as a flea.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fit%20as%20a%20flea. Accessed 26 Nov. 2020.

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