Words: fettle [MW]

Function: noun
: state or condition of health, fitness, wholeness, spirit, or form -- often used in the phrase in fine fettle

Function: transitive verb
Inflected Form(s): fet·tled; fet·tling /'fet-li[ng], 'fe-t&l-i[ng]/
Etymology: Middle English fetlen to shape, prepare; perhaps akin to Old English fæt vessel -- more at VAT
: to cover or line the hearth of (as a reverberatory furnace) with loose material (as sand or gravel)