riff-raff/ˈrɪf ræf; `rɪf ˌræf/ (esp 尤作 the riff-raff) n [U](derog 贬) ill-behaved people of the lowest social class; the rabble 下等社会的为非作歹者; 乌合之众 Don't bring any riff-raff into my house! 别把不三不四的人领到我家来!
牛津英汉双解词典