骚乱 (sāo luàn) is a noun meaning 'riot' or 'civil unrest' — a sudden, violent public disturbance involving a crowd, often driven by anger, protest, or panic. The first character 骚 (sāo) originally meant 'to disturb' or 'to agitate' (as in stirring up trouble), while 乱 (luàn) means 'chaos', 'disorder', or 'turmoil'. Together, they emphasize not just disorder but active, disruptive agitation — implying collective action that breaks social order.

This word carries strong negative connotations and is used primarily in formal news reports, official statements, or historical accounts. It is not used for minor arguments or everyday confusion; rather, it describes large-scale, threatening instability — such as protests turning violent, prison uprisings, or mass panic during disasters. Though 骚 can refer to 'itching' or even 'lewdness' in other contexts, here it functions purely as a semantic component of disturbance, unrelated to its animal-related homophone (e.g., 骚马 sāo mǎ, 'restless horse').