coarsen /ˈkɔːsən/ (coarsening,coarsened,coarsens)

• 1.  

  V-T/V-I（及物动词/不及物动词） If something coarsens or is coarsened, it becomes thicker or rougher in texture. 使变粗糙

  例：

  Skin thickens, dries, and coarsens after sun exposure.

  皮肤在阳光的暴晒下会变厚、变干且变粗糙。

• 2.  

  V-T/V-I（及物动词/不及物动词） If someone's behaviour or speech coarsens or if they coarsen it, they become less polite or they begin to speak in a less pleasant way. 变粗俗

  例：

  Her voice has deepened and coarsened with the years.

  她的声音随着岁月变更越发深哑。