no-no Meaning, definition in Cambridge English Dictionary
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Meaning of "no-no" - English Dictionary

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no-nonoun [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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