coarsen

动词 coarsen:

1. make or become coarse or coarser
2. make less subtle or refined

1. The sea air coarsened her skin.
   海上的空气使她的皮肤粗糙了。

coars.en

v.tr.intr.（及物动词和不及物动词）
coars.ened,coars.en.ing,coars.ens
To make or become coarse.
变粗，使粗：使或变成粗劣