- ERODED
- Deteriorated
- Eaten away
- Lost ground
- Wore away
- Diminished
- Ate into
- Slowly broke down
- Broke down
- Worn down
- Worn away
- Wore
- Affected by acid, in a way
- Became worn away
- Stole some material from?
- Took ground from?
- Moved away from the bank?
- Wore down
- Became weatherworn
- Crumbled
- Gradually wore down
- Worn
- Destroyed slowly
- Watered down?
- Disintegrated
- Undermined
- Got worn
- Really blown away?
- Worn by wind
- Ate at
- Ate away
- Broke the bank
- Worn in the rain?
- Rubbed down
- Like the Grand Canyon
- Weathered away
- Chipped away at
- Washed away
- Ground down
- Crumbled gradually
- Blew away, maybe
- Worn gradually
- Partially gone, in a way
- Diminished, as support
- Like shorelines, often
- Rust-eaten.
- Weakened
- Affected by wind or water
- Disintegrated slowly
- Subjected to ablation
- Subjected to planation
- Abraded
- Undercut
- Gradually disappeared
- In a weakened state
- Like many shorelines
- Like a ravine
- Like badlands
- Like some banks
- Lost some ground
- Eaten away, like the first words of 17-, 31-, 48- and 65-Across in order?
- Gradually diminished
- Like beaches during storms
- Like a seacoast after a storm, maybe
- Lost deposits, as a bank?
- Carved a canyon
- Like gullies
- Ate away at
- Destroyed by degrees
- Corroded
- Ate
- Not all there, say
- Worn away by water, maybe
- Like ancient canyon cliffs
- Like the Grand Canyon's walls
- Went from bad to worse
- Crumbled, as support
- Cut into
- Diminished by degrees
- Blown away?
- Made weaker
