Coarsen (verb)

To make or become rough or harsh in texture, quality, or nature.

Origin:

The word "coarsen" comes from the middle english "coarsen" which means to make or become rough or harsh.

Examples:

1. The sandpaper will coarsen the surface of the wood.
2. His voice coarsened as he shouted.
3. The prolonged use of the tool coarsened its edge.
4. The rough treatment coarsened her skin.
5. The long hours and stress of the job had coarsened his demeanor.