Wear away
Definition 1 of 2
Pro Tip 1/3Physical Change
Used when physical objects are altered by external forces like friction or weather. 
The steps leading to the monument have worn away after centuries of use.
Pro Tip 2/3Natural Processes
It often refers to changes that occur naturally over a long period. 
The coastline has worn away due to constant wave action.
Pro Tip 3/3Slow Progression
Emphasizes a gradual process, not an immediate change. 
The paint on the old house had worn away, revealing the wood beneath.