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no-no

[noh-noh] /ˈnoʊˌnoʊ/
noun, plural no-nos, no-no's. Informal.
1.
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
1940-1945
1940-45, Americanism; reduplication of no1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for no no

no-no

n.

1942, from reduplication of no.

Online Etymology Dictionary, © 2010 Douglas Harper
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2
3
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