Adjective

1. Perfectly fit; in excellent health; in excellent condition.
   • 1915, P. G. Wodehouse, Something New, ch. 2:

     You wake up, feeling as fit as a fiddle; you look at the window and see the sun, and thank Heaven for a fine day.

   • 2008, Alexander Jung and Christoph Pauly, "Iceland's Credit Crunch Blues," Businessweek, 11 Apr.:

     Icelanders will assure you that their economy is really as fit as a fiddle, and it is true that the country does produce a tidy budget surplus.