Related Clues:

• Use a strop
• It'll give you an edge
• It'll give you the edge
• Stimulate, as an appetite
• Improve, as one's skills
• Perfect, as one's skills
• Sharpen, as an appetite
• Sharpened to a fine edge
• Sharpen, as on a whetstone
• Improved
• Work on the edge?
• Make perfect
• Gave an edge
• Make sharper
• Put to the grindstone