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.

1940–45, Americanism; reduplication of no1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
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.
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