Related Clues:
- Shorelines do it
- Eat at the bank?
- Gradually destroy, as shoreline
- Chafe
- Show signs of weakening
- Bother the heck out of
- Eat away at the beach?
- Really ruffle
- Lose ground, literally
- Destroy slowly
- Steadily reduce, in a way
- Disappear slowly, in a way
- Really bug
- Deteriorate, in a way
- Make bank withdrawals?