fettle /ˈfɛtl̩/verb 7noun 6forms 3 verb7 •(Northern-England) To sort out, to fix, to mend, to repair.He is getting his saddle altered: fettling about this and that; does not consider what danger he is in. — 1858 •To remove (as by sanding) the seam lines left by the meeting of two molds. •To machine away seam lines or more generally to make small adjustments to a component or machine to improve its fit or operation.He wants to fettle his gearchange mechanism before the next competition. •To make preparations; to put things in order; to do trifling business.Nor list he now go whistling to the car, But sells his team , and fettleth to the war — 1597 •To line the hearth of a furnace with sand prior to pouring molten metal. •[with oneself] To be upset or in a bad mood.Divint fettle yersel ower that! •(no longer used) To prepare.But fettle your fine joints 'gainst Thursday next... — 1595 noun6 •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. — 1979 •One's mental state; spirits. •A person's mood or state, often assuming the worst.What’s yer fettle marra? •(dialect, UK) The act of fettling. •A seam line left by the meeting of mould pieces. •Sand used to line a furnace. formsfettled · fettling · fettles