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Noun: double negative  'dú-bul 'ne-gu-tiv
  1. A grammatically substandard but emphatic negative
    "double negative such as ‘I don't never go’"
     
  2. An affirmative constructed from two negatives
    "double negative such as ‘a not unwelcome outcome’"

Derived forms: double negatives

Type of: affirmative, negative

Encyclopedia: Double negative