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\ ˈnō-ˌnō 
\
\ plural no-no's or no-nos
Definition of no-no
1 : something unacceptable or forbidden
2 : no-hitter
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More Definitions for no-no
no-no
nounEnglish Language Learners Definition of no-no
informal
: something that people are not supposed to do because it is not proper, safe, fashionable, etc.
See the full definition for no-no in the English Language Learners Dictionary
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Time Traveler for no-no
The first known use of no-no was circa 1942
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