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no-no

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noun \ ˈnō-ˌnō \

Definition of no-no

plural no-no's or no-nos
1 :something unacceptable or forbidden
2 :no-hitter

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First Known Use of no-no

circa 1942

NO-NO Defined for English Language Learners

no-no

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noun

Definition of no-no for English Language Learners

  • : something that people are not supposed to do because it is not proper, safe, fashionable, etc.

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