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Synonyms
fet·tle (fĕt́l)

[From Middle English fetlen, to make ready, possibly from Old English fetel, girdle.]

noun 

    1. Proper or sound condition.
    2. Mental or emotional state; spirits: was in fine fettle.
  2. Metallurgy Loose sand or ore used to line the hearth of a reverberatory furnace in preparation for pouring molten metal.

transitive verb: -tled, -tling, -tles. 

Metallurgy
To line the hearth of (a reverberatory furnace) with loose sand or ore in preparation for pouring molten metal.