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English definition of “so-and-so”

so-and-so

noun [U] (PERSON NOT NAMED)    /ˈsəʊ.ənd.səʊ/ US  /ˈsoʊ.ənd.soʊ/ informal
used instead of a particular name to refer to someone or something, especially when the real name is not important or you have forgotten it: She always keeps me up to date with the latest gossip - you know, so-and-so from down the road is having a baby and so-and-so's just bought a car.Names and titles
(Definition of so-and-so noun (PERSON NOT NAMED) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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