Related Clues:

• Work on, as one's skills
• You might rub a knife across it
• Perfect, perhaps
• Make sharp
• Gain an edge
• Stimulate (appetite)
• Improve the edge of
• Ready a machete
• Spark, as an appetite
• Give an edge to?
• Excite, as an appetite
• Stimulate, as one's appetite
• Make sharper, as a blade
• Polish one's skills
• Sharpen the blade of (a tool/weapon)