The cliffs have eroded over the centuries.
The running water eroded a gully.
When water continually washes over soil and begins to wash away that soil, this is an example of a situation where the water erodes the soil.
When the side beds of a stream are washed away because of the ongoing movement of the water, this is an example of a situation where the side beds can be said to erode.
When someone's confidence is gradually worn away at and diminished, this is an example of a situation where his confidence is eroded.
Waves eroded the shore.
The water's acidity eroded the pipe.
The river eroded a deep valley.
Public confidence in the administration eroded.
Acid erodes metal.