"middle-ground" meaning in English

{
  "forms": [
    {
      "form": "middle-grounds",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "middle-ground (plural middle-grounds)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "middle ground"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
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        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
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      "examples": [
        {
          "ref": "1890, Jacob A[ugust] Riis, “The Sweaters of Jewtown”, in How the Other Half Lives: Studies among the Tenements of New York, New York, N.Y.: Charles Scribner’s Sons, →OCLC, page 133:",
          "text": "In fact, in presenting the home life of these people I have been at some pains to avoid the extreme of privation, taking the cases just as they came to hand on the safer middle-ground of average earnings.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Alternative spelling of middle ground"
      ],
      "id": "en-middle-ground-en-noun-jJH9GhBn",
      "links": [
        [
          "middle ground",
          "middle ground#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "middle-ground"
}

{
  "forms": [
    {
      "form": "middle-grounds",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "middle-ground (plural middle-grounds)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "middle ground"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "ref": "1890, Jacob A[ugust] Riis, “The Sweaters of Jewtown”, in How the Other Half Lives: Studies among the Tenements of New York, New York, N.Y.: Charles Scribner’s Sons, →OCLC, page 133:",
          "text": "In fact, in presenting the home life of these people I have been at some pains to avoid the extreme of privation, taking the cases just as they came to hand on the safer middle-ground of average earnings.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Alternative spelling of middle ground"
      ],
      "links": [
        [
          "middle ground",
          "middle ground#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "middle-ground"
}