Related Clues:

• Sharp side of a knife
• Jittery people are on it
• Blade's sharp side
• What airballs miss
• Peripheral ring
• Added boost
• Drum edge
• Slam-dunk handhold
• Cup top
• Trim a lawn
• Cutting ___ (most advanced)
• Move little by little to the border
• An edge, canyon or cup
• Brink of border
• Brink or border