Related Clues:
- Burnishes, shines
- Sharpens on strap, say razor
- Sharpens on stone
- Sharpens as on whetstone
- Sharpens, like knife on stone
- Gives an edge to
- Operates a refinery
- Brushes up on
- Fish extracts
- Improves, as skills
- Does refinery work
- Extracts metal from
- Coldwater fishes
- Extracts metals by heating
- Runs a blast furnace