Definition of roughen verb from the Oxford Advanced Learner's Dictionary

 

roughen

 verb
verb
BrE BrE//ˈrʌfn//
 
; NAmE NAmE//ˈrʌfn//
 
[intransitive, transitive]Verb Forms present simple I / you / we / they roughen
BrE BrE//ˈrʌfn//
 
; NAmE NAmE//ˈrʌfn//
 
he / she / it roughens
BrE BrE//ˈrʌfnz//
 
; NAmE NAmE//ˈrʌfnz//
 
past simple roughened
BrE BrE//ˈrʌfnd//
 
; NAmE NAmE//ˈrʌfnd//
 
past participle roughened
BrE BrE//ˈrʌfnd//
 
; NAmE NAmE//ˈrʌfnd//
 
-ing form roughening
BrE BrE//ˈrʌfnɪŋ//
 
; NAmE NAmE//ˈrʌfnɪŋ//
 
 
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to become rough; to make something rough His voice roughened with every word. roughen something Cold weather roughens your skin.
See the Oxford Advanced American Dictionary entry: roughen