'fine-tune' originates from the combination of 'fine' and 'tune', where 'fine' meant 'of high quality' and 'tune' meant 'to adjust a musical instrument'.

'fine-tune' evolved from the practice of adjusting musical instruments to achieve the desired sound, eventually becoming a term for making precise adjustments in various contexts.

Initially, it meant 'to adjust a musical instrument', but over time it evolved into its current meaning of 'making small adjustments to improve performance'.