no-no Meaning in the Cambridge English Dictionary
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Meaning of “no-no” in the English Dictionary

"no-no" in British English

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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 Learner’s Dictionary & Thesaurus © Cambridge University Press)

"no-no" in American English

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no-nonoun [C]

 us   /ˈnoʊˌnoʊ/
infml something that is ​thought to be ​unsuitable or ​unacceptable: Wearing ​shorts to ​work is a no-no.
(Definition of no-no from the Cambridge Academic Content Dictionary © Cambridge University Press)
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