Related Clues:

• Make a knife sharp
• Make more efficient
• Get to the point?
• Sharpen, as a skill
• Strop it!
• ___ one's appetite
• Revise for the better
• Strop
• Put a sharper edge on
• Polish, as one's skills
• Stimulate (the appetite)
• Improve an edge
• Work on
• Make more effective
• Sharpen 1-Across