Related Clues:

• Beat (out)
• Sharpen, as on a whetstone
• Beat slightly
• Work on the edge?
• Head start, e.g.
• Make perfect
• What trained athletes look for
• Part of a box
• Falling-off point
• Part of a blade
• Polygon part
• Defeat by a hair
• Good thing to have in competition
• ''Postcards From The ___''
• Borderline