fit as a flea
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(as) fit as a flea
In good health. Yes, I did have surgery a few months ago, but I'm as fit as a flea now. I just saw Eric recently, and he's as fit as a flea.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
fit as a fleain very good health.
The phrase makes reference to a flea's agility.
Farlex Partner Idioms Dictionary © Farlex 2017