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English definition of “no-no”

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noun [C usually singular] uk   /ˈnəʊ.nəʊ/ us    /ˈnoʊ.noʊ/ informal
something that is thought to be unsuitable or unacceptable: Total nudity is still a definite no-no on most of Europe's beaches.
(Definition of no-no from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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