coarsen

🇬🇧/ˈkɔːs(ə)n/ 🇺🇸/ˈkɔːrs(ə)n/ 14
If something coarsens or is coarsened, it becomes thicker or rougher in texture. 使变粗糙

verb [vt. 及物动词]vt. 使变粗;使变粗俗

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。

verb [vi. 不及物动词]vi. 变粗糙;变粗俗

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。

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