rough ‧ en /ˈrʌf ə n/ BrE AmE verb [intransitive and transitive]
[ Word Family: noun : ↑ rough , the rough, ↑ roughage , ↑ roughness ; verb : ↑ rough , ↑ roughen ; adverb : ↑ rough , ↑ roughly ; adjective : ↑ rough ]
to become rough, or to make something rough:
hands roughened by work