fettle
A state of physical condition; kilter or trim.
These strong 2-8-2s […] appeared in good fettle, especially those shedded at Lublin and several arrivals and departures were photographed in the fine evening light.
One's mental state; spirits.
Sand used to line a furnace.
A seam line left by the meeting of mould pieces.
Where it comes from
From Late Middle English fetlen (“(verb) to bestow; to fix, prepare, put in place; to prepare (oneself) for battle, gird up; to shape; to be about to, or to ready (oneself) to stay; (adjective) shaped (well or poorly)”) [and other forms], which possibly: * from Old English fetel (“belt, girdle, fettle”), from Proto-Germanic *fatilaz, further etymology unknown; or * from Old English fetian (“to fetch”), from Proto-Germanic *fatōną, *fatjaną (“to fetch”), from Proto-Indo-European *ped- (“foot”). Compare Old English ġefetelsod (“provided with a belt; trimmed, polished, ornamented”).
Adapted from the Wiktionary entry fettle (CC BY-SA 4.0).