"negativo duplo" meaning in Portuguese

{
  "forms": [
    {
      "form": "negativos duplos",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "negativo duplo m (plural negativos duplos)",
      "name": "pt-noun"
    }
  ],
  "lang": "Portuguese",
  "lang_code": "pt",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Portuguese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "pt",
          "name": "Linguistics",
          "orig": "pt:Linguistics",
          "parents": [
            "Language",
            "Social sciences",
            "Communication",
            "Sciences",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "double negative (the use of two negative words to express negativity)"
      ],
      "id": "en-negativo_duplo-pt-noun-klyNcqWq",
      "links": [
        [
          "linguistics",
          "linguistics"
        ],
        [
          "double negative",
          "double negative"
        ]
      ],
      "raw_glosses": [
        "(linguistics) double negative (the use of two negative words to express negativity)"
      ],
      "synonyms": [
        {
          "word": "duplo negativo"
        }
      ],
      "tags": [
        "masculine"
      ],
      "topics": [
        "human-sciences",
        "linguistics",
        "sciences"
      ]
    }
  ],
  "word": "negativo duplo"
}

{
  "forms": [
    {
      "form": "negativos duplos",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "negativo duplo m (plural negativos duplos)",
      "name": "pt-noun"
    }
  ],
  "lang": "Portuguese",
  "lang_code": "pt",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Portuguese countable nouns",
        "Portuguese entries with incorrect language header",
        "Portuguese lemmas",
        "Portuguese masculine nouns",
        "Portuguese multiword terms",
        "Portuguese nouns",
        "Portuguese nouns with red links in their headword lines",
        "pt:Linguistics"
      ],
      "glosses": [
        "double negative (the use of two negative words to express negativity)"
      ],
      "links": [
        [
          "linguistics",
          "linguistics"
        ],
        [
          "double negative",
          "double negative"
        ]
      ],
      "raw_glosses": [
        "(linguistics) double negative (the use of two negative words to express negativity)"
      ],
      "tags": [
        "masculine"
      ],
      "topics": [
        "human-sciences",
        "linguistics",
        "sciences"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "duplo negativo"
    }
  ],
  "word": "negativo duplo"
}