"guardline" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "guard",
        "3": "line"
      },
      "expansion": "guard + line",
      "name": "compound"
    }
  ],
  "etymology_text": "guard + line",
  "forms": [
    {
      "form": "guardlines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "guardline (plural guardlines)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1980, Ronald G. Knapp, China's island frontier: studies in the historical geography of Taiwan",
          "text": "The Japanese countered by augmenting the number of guards and extending the guardline to protect the camphor and timber workers. By 1900 a guardline enclosing Atayal territory was completed.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A defensive line of human guards, barriers, etc."
      ],
      "id": "en-guardline-en-noun-AmrHDVUP",
      "links": [
        [
          "defensive",
          "defensive"
        ],
        [
          "line",
          "line"
        ],
        [
          "barrier",
          "barrier"
        ]
      ]
    }
  ],
  "word": "guardline"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "guard",
        "3": "line"
      },
      "expansion": "guard + line",
      "name": "compound"
    }
  ],
  "etymology_text": "guard + line",
  "forms": [
    {
      "form": "guardlines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "guardline (plural guardlines)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English compound terms",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1980, Ronald G. Knapp, China's island frontier: studies in the historical geography of Taiwan",
          "text": "The Japanese countered by augmenting the number of guards and extending the guardline to protect the camphor and timber workers. By 1900 a guardline enclosing Atayal territory was completed.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A defensive line of human guards, barriers, etc."
      ],
      "links": [
        [
          "defensive",
          "defensive"
        ],
        [
          "line",
          "line"
        ],
        [
          "barrier",
          "barrier"
        ]
      ]
    }
  ],
  "word": "guardline"
}