IPA: /ˈkɔːrsən/
KK: /ˈkɔrsən/
To make something rough or less smooth in texture.
The artist decided to coarsen the surface of the canvas to create a more textured effect.
Past: coarsened
Past Participle: coarsened
Coarsen → It is formed from "coarse" (from Old French *cors*, meaning rough or crude) and "-en" (a suffix used to form verbs indicating to make or become). The word "coarsen" means to make something rough or less refined.
Think of something becoming 'rough' or 'crude' ('coarse') when it is 'made' or 'turned into' that state ('-en').