coars‧en /ˈkɔːsən $ ˈkɔːr-/ verb [intransitive and transitive]

1. to become thicker or rougher, or to make something thicker or rougher:
Hard work had coarsened his hands.

2. to become or to make someone become less polite in the way they talk or behave:
He’s been coarsened by his experience of war.

[TahlilGaran] Dictionary of Contemporary English ▲