fine-tune

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WordNet Dictionary
	Definition:		[v]  make fine adjustments or divide into marked intervals for optimal measuring; "calibrate an instrument"; "graduate a cylinder" [v]  adjust finely; "fine-tune the engine" [v]  improve or perfect by pruning or polishing; "refine one's style of writing"
	Synonyms:		calibrate, down, graduate, polish, refine, tweak
	See Also:		adjust, ameliorate, amend, better, civilise, civilize, cultivate, educate, improve, meliorate, school, set, train, tune, tune up