Wiktionary
banalize
vb. (context transitive English) To make something banal or commonplace.
Usage examples of "banalize".
It is scorned and banalized by pornography, desecrated by fornication and adultery, mocked by homosexuality, sabotaged by irregular unions, and cut in two by divorce.
Sade invents a perfect alibi for murder -- but at the price of banalizing the very act of murder, and rendering it utterly futile.