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no-no
The definition of a no no is something that should not be done or something that is against the rules.
(noun)An example of a no no is eating cookies before dinner after your mom said not to eat them.
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See no-no in Webster's New World College Dictionary
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noun pl. no-nos
Slang something that is forbidden or considered unwise to do, say, use, etc.
Origin: < No! No!, as said in admonishing a young child
See no-no in American Heritage Dictionary 4
noun pl. no-noes
Informal
- Something unacceptable or impermissible: “Even though his company wasn't the one involved in the case, what he did is considered a definite no-no” (Mike Royko).
- A social blunder; a faux pas.
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