Mental or emotional state; spirits: was in fine fettle.
Metallurgy Loose sand or ore used to line the hearth of a reverberatory furnace in preparation for pouring molten metal.
tr.v.
fet·tled, fet·tling, fet·tlesMetallurgy To line the hearth of (a reverberatory furnace) with loose sand or ore in preparation for pouring molten metal.
[From Middle English fetlen, to make ready, possibly from Old English fetel, girdle.]
"condition, state, trim," c.1750, from v. sense "to make ready, arrange" (14c.), from O.E. fetel "a girdle, belt," from P.Gmc. *fatiloz (cf. Ger. fessel, O.N. fetill), from *fat- "to hold."