coarsen /ˈkɔːsən/ ( coarsening, coarsened, coarsens )

• 1. 

  V-T/V-I 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。

  例：

  ...his gnarled, coarsened features.

  ...他那久经风霜、粗犷的线条。

• 2. 

  V-T/V-I 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。

  例：

  He had coarsened his voice to an approximation of Cockney.

  他的声音变得跟粗俗的伦敦佬差不多。