coarse + -en
coarsen (third-person singular simple present coarsens, present participle coarsening, simple past and past participle coarsened)
- (transitive) To make (more) coarse.
- 1941, Emily Carr, Klee Wyck, Chapter 6 "D'Sonoqua," 
- She appeared to be neither wooden nor stationary, but a singing spirit, young and fresh, passing through the jungle. No violence coarsened her; no power domineered to wither her. She was graciously feminine.
- 1978, R. Z. Sheppard, "She-Wits and Funny Persons," Time, 29 February, 1978, 
- […] as the years went by, democracy and its wide audiences tended to broaden and coarsen humor.
- Mary Whitehouse
- Bad language coarsens the whole quality of our life. It normalises harsh, often indecent language, which despoils our communication.
- Because the wool is of poor quality, it will coarsen the fabric.
- (intransitive) To become (more) coarse.
- 1922, F. Scott Fitzgerald, The Beautiful and Damned, "The Beating," 
- He was intolerable now except under the influence of liquor, and as he seemed to decay and coarsen under her eyes, Gloria's soul and body shrank away from him […]
1925, Ellen Glasgow, chapter 14, in Barren Ground:
[…] though her skin had coarsened in the last ten years, the dark red of her cheeks and lips was as vivid as ever.
- Carones, Creason, Croesan, canoers, carnose, corneas, earcons, narcose, sea corn, seacorn, sorance