Go downhill and Wearing away

Wearing away and go downhill are semantically related In some cases you can use "Wearing away" instead a verb phrase "Go downhill".

Wearing away noun - Geology) the mechanical process of wearing or grinding something down (as by particles washing over it.

Go downhill and wearing away are semantically related in decay topic. Sometimes you can use "Go downhill" instead a verb "Wearing away", if it concerns topics such as wither.