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1. Proper or sound condition.
2. Mental or emotional state; spirits.
References in periodicals archive ?
Likewise, the headlamps are, most unusually, dropped into an aperture in the front wings--one of the few composite panels--and these have to be fettled individually to final fit.
Almost every bit of the SLS has been fettled, including the six-speed gearbox which not only shifts faster, but is placed 10mm lower in the chassis to reduce the centre of gravity.
All the M's powerplants have been fettled to improve fuel consumption by up to 1.