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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
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for nono

Nono

/Italian ˈnɔːno/
noun
1.
Luigi (luˈiːdʒi). 1924–90, Italian composer of 12-tone music
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for nono

no-no

n.

1942, from reduplication of no.

Online Etymology Dictionary, © 2010 Douglas Harper
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