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English definition of “no-no”

no-no

noun [C usually singular]     /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.Unsuitable and unacceptable
(Definition of no-no noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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