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no–no

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noun \ˈnō-ˌnō\

Simple Definition of no–no

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

Source: Merriam-Webster's Learner's Dictionary

Full Definition of no–no

plural

no–no's

or

no–nos

  1. 1 :  something unacceptable or forbidden

  2. 2 :  no-hitter

Circa 1942

First Known Use of no–no

circa 1942


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