1) Brings to a fine edge 2) Brushes up on 3) Cutting edge creators 4) Cutting-edge creators 5) Fine-tunes 6) Gets an edge on 7) Gets sharp 8) Gives an edge 9) Gives an edge to 10) Gives the edge to 11) Improves 12) Improves as a skill 13) Makes a blade better 14) Makes better 15) Makes keener 16) Makes more acute 1) Sharpens 2) Whets