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

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
  1. 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).
  2. A social blunder; a faux pas.

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