Merriam-Webster Collegiate Dictionary - fettle

 I. noun  Etymology: 2~  Date: 1740 state or condition of health, fitness, wholeness, spirit, or form — often used in the phrase in fine ~  II. transitive verb  (~d; fettling)  Etymology: British dialect, to set in order, get ready, from Middle English fetlen to shape, prepare; perhaps akin to Old English fetian to fetch — more at fetch  Date: 1881 to cover or line the hearth of (as a reverberatory furnace) with loose material (as sand or gravel)