Possible Clues:

• Sharpen, especially by rubbing on stone
• Quicken, as an appetite
• Soaked taking on hard grind
• Sharpen on a grinder
• Make sharper, as a knife edge
• Make more acute
• To sharpen an implement, especially on a stone
• Make an edge sharper
• Arouse wife on the ground
• Pique, as one's appetite