Related Clues:

• Improve in small increments
• Make keener
• Make a point?
• Use a strop on
• Make a knife sharp
• Make more efficient
• Get to the point?
• Sharpen, as a skill
• Strop it!
• Revise for the better
• Polish, as one's skills
• Improve an edge
• Work on
• Make more effective
• Sharpen 1-Across