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fine-tune (v.)

also fine-tune, 1969, a back-formation from fine-tuning (1909 in reference to radio; earlier in various machinery contexts). From fine (adj.) + tune (v.). Related: Fine-tuning.

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Definitions of fine-tune from WordNet

fine-tune (v.)
improve or perfect by pruning or polishing;
Synonyms: polish / refine / down
fine-tune (v.)
adjust finely;
fine-tune the engine
Synonyms: tweak
fine-tune (v.)
make fine adjustments or divide into marked intervals for optimal measuring;
Synonyms: calibrate / graduate
From wordnet.princeton.edu