"jump-off point" meaning in English

{
  "forms": [
    {
      "form": "jump-off points",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "jump-off point (plural jump-off points)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "jumping-off point"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English 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"
        }
      ],
      "examples": [
        {
          "ref": "1980 August 30, Jan R. Fielding, “Iron Bras & Virgin Births Mar Feminist Science Fiction”, in Gay Community News, volume 8, number 6, page 8:",
          "text": "[The story] \"Equal Rights\" is also fine — and realistic! — as far as it goes. But I wished it were longer, that this had been the jump-off point for a more involved work.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Alternative form of jumping-off point"
      ],
      "id": "en-jump-off_point-en-noun-DsO988dZ",
      "links": [
        [
          "jumping-off point",
          "jumping-off point#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "jump-off point"
}

{
  "forms": [
    {
      "form": "jump-off points",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "jump-off point (plural jump-off points)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "jumping-off point"
        }
      ],
      "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": "1980 August 30, Jan R. Fielding, “Iron Bras & Virgin Births Mar Feminist Science Fiction”, in Gay Community News, volume 8, number 6, page 8:",
          "text": "[The story] \"Equal Rights\" is also fine — and realistic! — as far as it goes. But I wished it were longer, that this had been the jump-off point for a more involved work.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Alternative form of jumping-off point"
      ],
      "links": [
        [
          "jumping-off point",
          "jumping-off point#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "jump-off point"
}