Related Clues:

• Improve, as skills
• Use a whetstone
• Pinch sharply
• Perfect, as a skill
• Sharpen skills
• Practice, as skills
• Sharpen, as a blade
• Use a strop
• Make minor adjustments
• Make adjustments
• It'll give you an edge
• It'll give you the edge
• Improve, as one's skills
• Perfect, as one's skills
• Sharpen, as on a whetstone