Related Clues:

• Wash away
• Become worn down
•     Movie shot
• Shorelines do it
• Eat at the bank?
• Gradually destroy, as shoreline
• Show signs of weakening
• Gnaw at
• Eat away at the beach?
• Lose ground, literally
• Lose intensity
• Destroy slowly
• Steadily reduce, in a way
• Disappear slowly, in a way
• Yellow flag