Fet·tle, v. i. To make preparations; to put things in order; to do trifling business. [Prov. Eng.]
Fet·tle v. t.
1. To repair; to prepare; to put in order. [Prov. Eng.]
2. Metal. To cover or line with a mixture of ore, cinders, etc., as the hearth of a puddling furnace.
Fet·tle, n. The act of fettling. [Prov. Eng.]
In fine fettle, in good spirits.
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fettle
n : a state of fitness and good health; "in fine fettle"