'fine-tune' definitions:

Definition of 'fine-tune'

(from WordNet)
verb
Improve or perfect by pruning or polishing; "refine one's style of writing" [syn: polish, refine, fine-tune, down]
verb
Adjust finely; "fine-tune the engine" [syn: fine-tune, tweak]
verb
Make fine adjustments or divide into marked intervals for optimal measuring; "calibrate an instrument"; "graduate a cylinder" [syn: calibrate, graduate, fine-tune]

Definition of 'fine-tune'

From: GCIDE
  • fine-tune \fine-tune\ v. t. to adjust carefully and precisely so as to achieve optimum performance or efficiency; as, The mechanic fine-tuned the engine. [WordNet 1.5]