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[noh-noh] /ˈnoʊˌnoʊ/
noun, plural no-nos, no-no's. Informal.
anything that is forbidden or not advisable, as because of being improper or unsafe:
If you want to lose weight, rich desserts are a no-no.
Origin of no-no
1940-45, Americanism; reduplication of no1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for no-no
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Historical Examples
  • no-no, that won't do; you mustn't talk, and you mustn't retch and gag that way, either—you'll wake up your poor brother.

    Those Extraordinary Twins Mark Twain (Samuel Clemens)
  • They're going to take no-no home, then we're all going to the movies.

    Ruggles of Red Gap Harry Leon Wilson
  • "no-no; I thought of that myself, and Nemu too advised it," cried Ani.

    Uarda, Complete Georg Ebers
Word Origin and History for no-no

1942, from reduplication of no.

Online Etymology Dictionary, © 2010 Douglas Harper
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