Etymology
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coarsen (v.)

"to make coarse or coarser," in any sense, 1805, from coarse + -en (2). Related: Coarsened; coarsening.

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Definitions of coarsen

coarsen (v.)
make or become coarse or coarser;
coarsen the surface
Their minds coarsened
coarsen (v.)
make less subtle or refined;
coarsen one's ideals
From wordnet.princeton.edu