plural no-no's or no-nos
1
: something unacceptable or forbidden
2

Examples of no-no in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
While blowing leaves into the street is a no-no, so too is pushing leaves into other common areas like walkways, sidewalks, and other neighbors’ yards. Patricia Shannon, Southern Living, 24 Sep. 2025 That sort of adventure from Forest defenders was definitely a Nuno no-no. Paul Taylor, New York Times, 22 Sep. 2025 The Rockies haven't been held hitless since the Dodgers' Clayton Kershaw fired a no-no in an 8-0 victory on June 18, 2014. Field Level Media, Reuters, 9 Sep. 2025 And then Ritter, after breaking up the no-no, was removed in the ninth inning after rolling his ankle diving back into second base. Kyle Newman, Denver Post, 9 Sep. 2025 See All Example Sentences for no-no

Word History

First Known Use

circa 1942, in the meaning defined at sense 1

Time Traveler
The first known use of no-no was circa 1942

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Cite this Entry

“No-no.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/no-no. Accessed 30 Sep. 2025.

Kids Definition

no-no

noun
ˈnō-ˌnō
plural no-no's or no-nos
: something that is unacceptable or forbidden

More from Merriam-Webster on no-no

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