- v make rough or rougher
roughen the surfaces so they will stick to each other
- As humans grow older, the innermost layer (intima) of the arteries, ordinarily a thin, smooth membrane, tends to roughen and thicken in a process that may be compared to what .
- Fakers cannot achieve this subtle chiaroscuro, so they roughen their surfaces with sandblasting to simulate age.
- If this happens often enough, the artery wall will thicken, roughen and begin to break down.