no-no


no–no

noun \ˈnō-ˌnō\

: something that people are not supposed to do because it is not proper, safe, fashionable, etc.

plural no–no's or no–nos

Full Definition of NO-NO

1
:  something unacceptable or forbidden
2
:  no-hitter

First Known Use of NO-NO

circa 1942

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