definition of
fine-tune

[1] #1 fine-tune v. [polish, refine, down] improve or perfect by pruning or polishing; "refine one's style of writing". wn

[2] #2 fine-tune v. [tweak] adjust finely; "fine-tune the engine". wn

[3] #3 fine-tune v. [calibrate, graduate] make fine adjustments or divide into marked intervals for optimal measuring; "calibrate an instrument"; "graduate a cylinder". wn