coarsen
verb (used with or without object)
to make or become coarse.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
He knew that his association with the daughter of the landlord of the Thorn and Thistle was coarsening him, making him have lower standards of life, making everything poorer, more sordid.
From Tommy by Joseph Hocking