no-no

noun
\ˈnō-ˌnō \
plural no-no's or no-nos

Definition of no-no 

1 : something unacceptable or forbidden

2 : no-hitter

First Known Use of no-no

circa 1942, in the meaning defined at sense 1

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The first known use of no-no was circa 1942

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More Definitions for no-no

no-no

noun

English Language Learners Definition of no-no

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

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