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English definition of “so-and-so”

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so-and-so

noun [C]  /ˈsoʊ·ənˌsoʊ/ ( plural so-and-sos) infml us  
(used instead of an actual name) a particular person or thing: He asked if I knew where so-and-so lives. If you say that someone is a so-and-so, you do not have a good opinion of that person: You can't trust that so-and-so.
(Definition of so-and-so from the Cambridge Academic Content Dictionary © Cambridge University Press)
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