riff-raff
noun [ plural ] disapproving uk/ˈrɪf.ræf/ us/ˈrɪf.ræf/
下等人;贱民
people with a bad reputation or of a low social class
She says that charging high prices will keep the riff-raff out. 她说高收费会把那些下等人拒之门外。
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