"battle ground" meaning in English

{
  "forms": [
    {
      "form": "battle grounds",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "battle ground (plural battle grounds)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "battleground"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2020 January 2, “North demands Johnson delivers on promises”, in Rail, page 14",
          "text": "The North has - rightly - been a key battle ground in this election, with pledges made on improving our transport and creating opportunities.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of battleground."
      ],
      "id": "en-battle_ground-en-noun-ulJ0KZFB",
      "links": [
        [
          "battleground",
          "battleground#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "battle ground"
}

{
  "forms": [
    {
      "form": "battle grounds",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "battle ground (plural battle grounds)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "battleground"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2020 January 2, “North demands Johnson delivers on promises”, in Rail, page 14",
          "text": "The North has - rightly - been a key battle ground in this election, with pledges made on improving our transport and creating opportunities.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of battleground."
      ],
      "links": [
        [
          "battleground",
          "battleground#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "battle ground"
}