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Definition of no-no noun from the Oxford Advanced Learner's Dictionary

no-no

noun
 
/ˈnəʊ nəʊ/
 
/ˈnəʊ nəʊ/
[singular] (informal)
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  1. a thing or a way of behaving that is not acceptable in a particular situation
    • Earrings for men were once a definite no-no.
See no-no in the Oxford Advanced American Dictionary
generic
adjective
 
 
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