no-no


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a no-no

Something, typically an action, that is objectionable or prohibited. If you're trying to become friends with this woman, criticizing her style of parenting is a no-no. Talking in the middle of a Broadway play is a real no-no.

no-no

(ˈnono)
n. something that is not (to be) done. (Essentially juvenile.) She seems to delight in doing all the no-nos.