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English definition of “idiot”

idiot

noun [C] uk   /ˈɪd.i.ət/ us  
B2 a stupid person or someone who is behaving in a stupid way: Some idiot left the tap running in the bathroom and there's water everywhere. [as form of address] You stupid idiot - that's a month's work you've lost!Stupid and silly people
(Definition of idiot from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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