fine fettle, in

in fine fettle

In good physical and/or mental health. A: "I heard you had the flu last week, so how are you feeling now?" B: "I'm finally back in fine fettle, thank goodness!" I had been in fine fettle for a while, but now that school is over I'm feeling pretty sad.
See also: fettle, fine
Farlex Dictionary of Idioms.

in fine fettle

INFORMAL, OLD-FASHIONED
If someone or something is in fine fettle, they are in very good health or condition. You seem in fine fettle. Helped by low interest rates, the banks are in fine fettle.
See also: fettle, fine
Collins COBUILD Idioms Dictionary, 3rd ed.

in fine fettle

in very good condition.
Fettle was recorded in a mid 18th-century glossary of Lancashire dialect as meaning ‘dress, case, condition’. It is now seldom found outside this phrase and its variants, which include in good fettle and in high fettle .
See also: fettle, fine
Farlex Partner Idioms Dictionary

fine fettle, in

In excellent condition. This expression comes from the old dialect verb “to fettle,” which meant to put right. It was first put as “in good fettle,” and was so used throughout the nineteenth century. Alliteration has helped it to survive.
See also: fine
The Dictionary of Clichés by Christine Ammer
See also:
  • be in fine fettle
  • fettle
  • in fine fettle
  • in fine/good fettle
  • have (someone or something) by the ears
  • have something by the ears
  • get well
  • fighting fit
  • rebound from
  • rebound from (someone or something)