coarsen

1. V-T/V-I If something coarsens or is coarsened, it becomes thicker or rougher in texture. 使變粗糙

Skin thickens, dries, and coarsens after sun exposure. 皮膚在陽光的暴曬下會變厚、變乾且變粗糙。

...his gnarled, coarsened features. ...他那久經風霜、粗獷的線條。

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. 變粗俗

Her voice has deepened and coarsened with the years. 她的聲音隨著嵗月變更越發深啞。

He had coarsened his voice to an approximation of Cockney. 他的聲音變得跟粗俗的倫敦佬差不多。