rough·en 
/ˈrʌfən/ verb
rough·ens; rough·ened; rough·en·ing /ˈrʌfən/ verb : to become rough or cause (something) to become rough [+ obj] ▪ Roughen the surface with a file before you apply the glue. ▪ Her hands were roughened by years of hard work. [no obj] ▪ Age caused his skin to roughen.
