"mère-grand" meaning in French

{
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "mère",
        "3": "grand"
      },
      "expansion": "mère + grand",
      "name": "af"
    }
  ],
  "etymology_text": "From mère + grand.",
  "forms": [
    {
      "form": "mères-grand",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f",
        "2": "mères-grand"
      },
      "expansion": "mère-grand f (plural mères-grand)",
      "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"
        },
        {
          "kind": "topical",
          "langcode": "fr",
          "name": "Female family members",
          "orig": "fr:Female family members",
          "parents": [
            "Family members",
            "Female people",
            "Family",
            "Female",
            "People",
            "Gender",
            "Human",
            "Biology",
            "Psychology",
            "Sociology",
            "All topics",
            "Sciences",
            "Social sciences",
            "Fundamental",
            "Society"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "Little Red Riding Hood went through the forest to take a little pot of butter and a cake to her grandma.",
          "text": "Le Petit Chaperon rouge traverse la forêt pour apporter un petit pot de beurre et une galette à sa mère-grand.",
          "type": "example"
        }
      ],
      "glosses": [
        "grandma"
      ],
      "id": "en-mère-grand-fr-noun-uo0-ai2L",
      "links": [
        [
          "grandma",
          "grandma"
        ]
      ],
      "raw_glosses": [
        "(informal, dated) grandma"
      ],
      "synonyms": [
        {
          "word": "grand-mère"
        },
        {
          "word": "grand-maman"
        },
        {
          "word": "aïeule"
        },
        {
          "word": "mamie"
        },
        {
          "word": "mémé"
        },
        {
          "word": "mémère"
        },
        {
          "word": "bonne-maman"
        }
      ],
      "tags": [
        "dated",
        "feminine",
        "informal"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/mɛʁ.ɡʁɑ̃/"
    },
    {
      "audio": "LL-Q150 (fra)-WikiLucas00-mère-grand.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/e/e3/LL-Q150_%28fra%29-WikiLucas00-m%C3%A8re-grand.wav/LL-Q150_%28fra%29-WikiLucas00-m%C3%A8re-grand.wav.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/e/e3/LL-Q150_%28fra%29-WikiLucas00-m%C3%A8re-grand.wav/LL-Q150_%28fra%29-WikiLucas00-m%C3%A8re-grand.wav.ogg"
    }
  ],
  "word": "mère-grand"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "mère",
        "3": "grand"
      },
      "expansion": "mère + grand",
      "name": "af"
    }
  ],
  "etymology_text": "From mère + grand.",
  "forms": [
    {
      "form": "mères-grand",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f",
        "2": "mères-grand"
      },
      "expansion": "mère-grand f (plural mères-grand)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "French 2-syllable words",
        "French compound terms",
        "French countable nouns",
        "French dated terms",
        "French entries with incorrect language header",
        "French feminine nouns",
        "French informal terms",
        "French lemmas",
        "French multiword terms",
        "French nouns",
        "French terms with IPA pronunciation",
        "French terms with quotations",
        "Pages with 1 entry",
        "Pages with entries",
        "fr:Female family members"
      ],
      "examples": [
        {
          "english": "Little Red Riding Hood went through the forest to take a little pot of butter and a cake to her grandma.",
          "text": "Le Petit Chaperon rouge traverse la forêt pour apporter un petit pot de beurre et une galette à sa mère-grand.",
          "type": "example"
        }
      ],
      "glosses": [
        "grandma"
      ],
      "links": [
        [
          "grandma",
          "grandma"
        ]
      ],
      "raw_glosses": [
        "(informal, dated) grandma"
      ],
      "synonyms": [
        {
          "word": "grand-mère"
        },
        {
          "word": "grand-maman"
        },
        {
          "word": "aïeule"
        },
        {
          "word": "mamie"
        },
        {
          "word": "mémé"
        },
        {
          "word": "mémère"
        },
        {
          "word": "bonne-maman"
        }
      ],
      "tags": [
        "dated",
        "feminine",
        "informal"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/mɛʁ.ɡʁɑ̃/"
    },
    {
      "audio": "LL-Q150 (fra)-WikiLucas00-mère-grand.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/e/e3/LL-Q150_%28fra%29-WikiLucas00-m%C3%A8re-grand.wav/LL-Q150_%28fra%29-WikiLucas00-m%C3%A8re-grand.wav.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/e/e3/LL-Q150_%28fra%29-WikiLucas00-m%C3%A8re-grand.wav/LL-Q150_%28fra%29-WikiLucas00-m%C3%A8re-grand.wav.ogg"
    }
  ],
  "word": "mère-grand"
}