"sang bleu" meaning in French

{
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "es",
        "3": "sangre azul"
      },
      "expansion": "Calque of Spanish sangre azul",
      "name": "calque"
    }
  ],
  "etymology_text": "Calque of Spanish sangre azul.",
  "head_templates": [
    {
      "args": {
        "1": "m",
        "2": "-"
      },
      "expansion": "sang bleu m (uncountable)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "blue blood (noble or aristocratic ancestry)"
      ],
      "id": "en-sang_bleu-fr-noun-US9fu698",
      "links": [
        [
          "blue blood",
          "blue blood"
        ]
      ],
      "tags": [
        "masculine",
        "uncountable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/sɑ̃ blø/"
    }
  ],
  "word": "sang bleu"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "es",
        "3": "sangre azul"
      },
      "expansion": "Calque of Spanish sangre azul",
      "name": "calque"
    }
  ],
  "etymology_text": "Calque of Spanish sangre azul.",
  "head_templates": [
    {
      "args": {
        "1": "m",
        "2": "-"
      },
      "expansion": "sang bleu m (uncountable)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "French entries with incorrect language header",
        "French lemmas",
        "French masculine nouns",
        "French multiword terms",
        "French nouns",
        "French terms calqued from Spanish",
        "French terms derived from Spanish",
        "French terms with IPA pronunciation",
        "French uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "blue blood (noble or aristocratic ancestry)"
      ],
      "links": [
        [
          "blue blood",
          "blue blood"
        ]
      ],
      "tags": [
        "masculine",
        "uncountable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/sɑ̃ blø/"
    }
  ],
  "word": "sang bleu"
}