One of the mysteries of the English language finally explained.
1A person skilled in tuning pianos or other musical instruments very precisely; specifically a person who does this professionally.
2Any device used for the fine tuning of electronic equipment.
3Economics. A person who advocates minor changes in monetary and fiscal policy in order to maintain a stable level of aggregate demand.
Late 19th century. From fine + tuner, after fine-tuned.
fine tuner/ˌfʌɪn ˈtʃuːnə//ˌfʌɪn ˈtjuːnə/
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