no no

no-no

[noh-noh]
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:
1940–45, Americanism; reduplication of no1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Slang Dictionary

no-no definition

[ˈnono]
  1. n.
    something that is not (to be) done. (Essentially juvenile.) : She seems to delight in doing all the no-nos.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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