double negative

/D AH1 B AH0 L N EH1 G AH0 T IH0 V/
noun
  1. 1

    A phrase in which there are two negative words or their compounds (e.g. no, not, never, none, etc), occasionally leading to ambiguity in the meaning, but necessary in some foreign languages.

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Source: https://en.wiktionary.org/wiki/double%20negative