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Riff-raff is an name for people you look down on — noisy, badly behaved, or “not our sort.” It is class talk: the speaker wants to sound above the crowd. An older person might say they do not want that riff-raff in the shop, meaning rowdy or poor-looking people. Younger speakers use it less, or they use it with a laugh, as if they know it is a snobbish word. It is informal, and rude if you aim it at real people. Do not put it in a polite essay. The two halves only rhyme; this riff is not the bit of music, and raff is not a word you need.
烏合之眾；不三不四的人
組成A rhyming pair that works as one insult. The pieces do not have useful meanings on their own in modern English.
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
這個拼法也被記錄為下列字的變化形：
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。