There isn't one specific river term for erosion. The term erosion itself is used in river contexts. However, depending on the specific type of erosion and its effects, you might encounter terms like:

* Downcutting: Erosion that deepens the river channel.

* Lateral erosion: Erosion that widens the river channel.

* Headward erosion: Erosion that extends the river upstream.

* Abrasion: Erosion caused by the grinding action of sediment carried by the river.

* Hydraulic action: Erosion caused by the force of water itself.

* Solution: Erosion caused by the dissolving of rock by the river water.

* Bank erosion: Erosion of the river banks.

So, the specific term for erosion in a river depends on the context and the specific type of erosion taking place.