IPA: /ˈrʌfən/
KK: /ˈrʌfən/
To make something have a rough surface or texture.
The carpenter decided to roughen the wood before applying the finish.
Past: roughened
Past Participle: roughened
Roughen → It is formed from "rough" (from Old English *ruh*, meaning uneven or coarse) and "-en" (a suffix used to form verbs indicating to make or become). The word "roughen" means to make something rough or to become rough.
Think of something becoming 'uneven' or 'coarse' ('rough') when you add the action of making it so ('-en').