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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