Related Clues:
- Improves, as skills
- Almost trustworthy, but gets sharp
- Perfects, sharpens
- Stimulates, as an appetite
- Perfects, as one's skills
- Piques, as an appetite
- Improves, as a skill
- Polishes, as a skill
- Improves one's edge?
- Sharpens, as a blade
- Makes sharp again
- Almost trustworthy, gets sharp
- Gives an edge
- Sharpens on a grindstone
- Works at the cutting edge?