Related Clues:

• Grind, maybe
• Improve, in a way
• Pique
• Sharpen, as a knife
• Refine
• Sharpen, as one's skills
• Stimulate, as the appetite
• Get an edge
• Cutting edge creator
• Use a whetstone on
• Sharpen by grinding
• Give an edge
• Improve, as skills
• Use a whetstone
• Perfect, as a skill