so-and-so

noun

/ˈsəʊ ən səʊ/

(plural so-and-sos)

(informal)

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[usually singular] used to refer to a person, thing, etc. when you do not know their name or when you are talking in a general way（指叫不上名字的人、物，或泛指）某某人（或事物）
- What would you say to Mrs So-and-so who has called to complain about a noisy neighbour?要是哪位太太嫌邻居太吵闹，打电话投诉，你怎么跟她说？
an annoying or unpleasant person. People sometimes say so-and-so to avoid using an offensive word.恼人的家伙；讨厌鬼
- He's an ungrateful so-and-so.他是个忘恩负义的家伙。

so-and-so