低俗化

化 (huà) is the suffix '-ization': 现代化 (xiàndàihuà, modernization), 全球化 (quánqiúhuà, globalization), 城市化 (chéngshìhuà, urbanization). Take any adjective or noun and bolt 化 on the end to mean 'becoming-X'. Here 低俗 (dīsú, 'low / vulgar') + 化 = 'becoming vulgar'.

Common in editorial and policy language about media, internet content, and pop culture - typically used disapprovingly by critics or regulators.