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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. 2015.
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Examples from the web for no-no
  • The second no-no was one of the first night games in major league history.
  • Empty seats are a no-no on camera, so when stars win or head to the loo, an army of seat-fillers is called upon to replace them.
Word Origin and History for no-no

1942, from reduplication of no.

Online Etymology Dictionary, © 2010 Douglas Harper
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