"de gratis" meaning in Spanish

{
  "head_templates": [
    {
      "args": {},
      "expansion": "de gratis",
      "name": "es-adv"
    }
  ],
  "hyphenation": [
    "de"
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Spanish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "We will give you a bottle of wine for free when buying ten products.",
          "text": "Le daremos de gratis una botella vino con la compra de diez productos.",
          "type": "example"
        }
      ],
      "glosses": [
        "for free, at no cost"
      ],
      "id": "en-de_gratis-es-adv-tgOz7k7Y",
      "links": [
        [
          "free",
          "free"
        ],
        [
          "cost",
          "cost"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) for free, at no cost"
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/de ˈɡɾatis/"
    },
    {
      "ipa": "[d̪e ˈɣ̞ɾa.t̪is]"
    }
  ],
  "word": "de gratis"
}

{
  "head_templates": [
    {
      "args": {},
      "expansion": "de gratis",
      "name": "es-adv"
    }
  ],
  "hyphenation": [
    "de"
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "Spanish adverbs",
        "Spanish entries with incorrect language header",
        "Spanish idioms",
        "Spanish lemmas",
        "Spanish multiword terms",
        "Spanish terms with IPA pronunciation",
        "Spanish terms with usage examples"
      ],
      "examples": [
        {
          "english": "We will give you a bottle of wine for free when buying ten products.",
          "text": "Le daremos de gratis una botella vino con la compra de diez productos.",
          "type": "example"
        }
      ],
      "glosses": [
        "for free, at no cost"
      ],
      "links": [
        [
          "free",
          "free"
        ],
        [
          "cost",
          "cost"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) for free, at no cost"
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/de ˈɡɾatis/"
    },
    {
      "ipa": "[d̪e ˈɣ̞ɾa.t̪is]"
    }
  ],
  "word": "de gratis"
}