Source : WordNet®

fine-tune
     v 1: improve or perfect by pruning or polishing; "refine one's
          style of writing" [syn: {polish}, {refine}, {down}]
     2: adjust finely; "fine-tune the engine" [syn: {tweak}]
     3: make fine adjustments or divide into marked intervals for
        optimal measuring; "calibrate an instrument"; "graduate a
        cylinder" [syn: {calibrate}, {graduate}]