coarsen
/ˈkɔːsən/verb
1- make or become rough（使）变粗糙：
with obj. her hands were coarsened by outside work户外工作使她双手变得粗糙。
no obj. his facial features appeared to coarsen with age.他的五官随年龄的增长越显粗糙。
1.1
- make or become crude, vulgar, or unpleasant（使）变粗鲁; （使）变粗俗; （使）变讨厌：
no obj. the voice coarsened.声音变得粗鲁了。