Related Clues:

• Sharpen 1-Across
• Opposite of dull
• Improve, as a skill
• Put to an oilstone
• Ready the machete
• Ready, as a machete
• Make more perfect
• Sharpen on stone
• Sharpen tool on stone
• Aid in gaining an edge
• Apply to an emery wheel
• Work on, as one's skills
• You might rub a knife across it
• Perfect, perhaps
• Make sharp