Related Clues:

• Arouses
• Hones
• Sharpens, as skills
• Sharpens an ax, e.g.
• Sharpens, as a knife
• Appetizers, e.g.
• Makes keener
• Makes sharp
• Works on
• Makes keen
• Zeros (in on)
• Makes sharper
• Sharpens the edge of
• Cutting-edge creators
• Tweaks