noun
corruption of public morals; offense against public morality
A formal, legalistic yojijukugo referring to acts that harm public decency or moral standards. Often used in legal contexts or discussions of obscenity laws.
その雑誌は風俗壊乱の疑いで発売禁止になった。
The magazine was banned on suspicion of corrupting public morals.
猥褻 (わいせつ) means 'obscene' or 'indecent' and is more commonly used in everyday contexts. 風俗壊乱 is a formal, compound term specifically for legal or moral corruption of public decency.
A yojijukugo composed of 風俗 (public morals/customs) and 壊乱 (corruption/disorder). The exact historical origin is uncertain, but it is used in modern legal and formal contexts.