"battle ground" meaning in English

{
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      "tags": [
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      "expansion": "battle ground (plural battle grounds)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        {
          "word": "battleground"
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      "examples": [
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          "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": "quote"
        }
      ],
      "glosses": [
        "Alternative form of battleground."
      ],
      "id": "en-battle_ground-en-noun-ulJ0KZFB",
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          "battleground#English"
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  "word": "battle ground"
}

{
  "forms": [
    {
      "form": "battle grounds",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "expansion": "battle ground (plural battle grounds)",
      "name": "en-noun"
    }
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "battleground"
        }
      ],
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        "English countable nouns",
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      "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": "quote"
        }
      ],
      "glosses": [
        "Alternative form of battleground."
      ],
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          "battleground#English"
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  ],
  "word": "battle ground"
}