fit as a flea
idiom
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 24 May. 2025.
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