Related Clues:

• Shorelines do it
• Eat at the bank?
• Gradually destroy, as shoreline
• Show signs of weakening
• Gnaw at
• Eat away at the beach?
• Inch back
• Lose ground, literally
• Destroy slowly
• Steadily reduce, in a way
• Disappear slowly, in a way
• Draw back
• Deteriorate, in a way
• Become more distant
• Make bank withdrawals?