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

     

    coarsen

     verb
    verb
    BrE BrE//ˈkɔːsn//
     
    ; NAmE NAmE//ˈkɔːrsn//
     
    Verb Forms present simple I / you / we / they coarsen
    BrE BrE//ˈkɔːsn//
     
    ; NAmE NAmE//ˈkɔːrsn//
     
    he / she / it coarsens
    BrE BrE//ˈkɔːsnz//
     
    ; NAmE NAmE//ˈkɔːrsnz//
     
    past simple coarsened
    BrE BrE//ˈkɔːsnd//
     
    ; NAmE NAmE//ˈkɔːrsnd//
     
    past participle coarsened
    BrE BrE//ˈkɔːsnd//
     
    ; NAmE NAmE//ˈkɔːrsnd//
     
    -ing form coarsening
    BrE BrE//ˈkɔːsnɪŋ//
     
    ; NAmE NAmE//ˈkɔːrsnɪŋ//
     
     
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  1. 1[intransitive, transitive] to become or make something become thicker and/or rougher Her hair gradually coarsened as she grew older. coarsen something His features had been coarsened by the weather.
  2. 2[transitive, intransitive] coarsen (somebody) to become or make somebody become less polite and often offensive in the way they behave The six long years in prison had coarsened him.
See the Oxford Advanced American Dictionary entry: coarsen