Related Clues:

• What spots on 1-Down show
• Dentist's concern
• Dental woe
• Subject to ablation
• Lose underpinnings, e.g.
• Slowly lose ground
• Gradually destroy, as confidence
• Lessen gradually
• Wash away, as soil
• Deterioration
• Diminish gradually
• Become weatherworn
• Diminish, in a way
• Some shorelines do it
• Opposite of strengthen