"first island chain" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "zh",
        "3": "-"
      },
      "expansion": "Calque of Chinese",
      "name": "calque"
    },
    {
      "args": {
        "1": "第一島鏈"
      },
      "expansion": "第一島鏈／第一岛链 (Dìyī dǎoliàn)",
      "name": "zh-l"
    }
  ],
  "etymology_text": "Calque of Chinese 第一島鏈／第一岛链 (Dìyī dǎoliàn).",
  "head_templates": [
    {
      "args": {
        "head": "first island chain"
      },
      "expansion": "first island chain",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Politics",
          "orig": "en:Politics",
          "parents": [
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The first chain of major archipelagos out from the East Asian continental mainland coast. Principally composed of the Kuril Islands, Japanese Archipelago, Ryu Kyu Islands, Taiwan, the northern Philippines, and Borneo; from the Kamchatka Peninsula to the Malay Peninsula."
      ],
      "id": "en-first_island_chain-en-name-zivV~aje",
      "links": [
        [
          "politics",
          "politics"
        ],
        [
          "archipelago",
          "archipelago"
        ],
        [
          "East Asian",
          "East Asian"
        ],
        [
          "continental",
          "continental"
        ],
        [
          "mainland",
          "mainland"
        ],
        [
          "coast",
          "coast"
        ],
        [
          "Kuril Islands",
          "Kuril Islands"
        ],
        [
          "Japanese Archipelago",
          "Japanese Archipelago"
        ],
        [
          "Ryu Kyu Islands",
          "Ryu Kyu Islands"
        ],
        [
          "Taiwan",
          "Taiwan"
        ],
        [
          "Philippines",
          "Philippines"
        ],
        [
          "Borneo",
          "Borneo"
        ],
        [
          "Kamchatka Peninsula",
          "Kamchatka Peninsula"
        ],
        [
          "Malay Peninsula",
          "Malay Peninsula"
        ]
      ],
      "raw_glosses": [
        "(politics) The first chain of major archipelagos out from the East Asian continental mainland coast. Principally composed of the Kuril Islands, Japanese Archipelago, Ryu Kyu Islands, Taiwan, the northern Philippines, and Borneo; from the Kamchatka Peninsula to the Malay Peninsula."
      ],
      "related": [
        {
          "word": "second island chain"
        },
        {
          "word": "Second Island Chain"
        },
        {
          "word": "third island chain"
        },
        {
          "word": "Third Island Chain"
        }
      ],
      "synonyms": [
        {
          "word": "First Island Chain"
        }
      ],
      "topics": [
        "government",
        "politics"
      ]
    }
  ],
  "word": "first island chain"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "zh",
        "3": "-"
      },
      "expansion": "Calque of Chinese",
      "name": "calque"
    },
    {
      "args": {
        "1": "第一島鏈"
      },
      "expansion": "第一島鏈／第一岛链 (Dìyī dǎoliàn)",
      "name": "zh-l"
    }
  ],
  "etymology_text": "Calque of Chinese 第一島鏈／第一岛链 (Dìyī dǎoliàn).",
  "head_templates": [
    {
      "args": {
        "head": "first island chain"
      },
      "expansion": "first island chain",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "related": [
    {
      "word": "second island chain"
    },
    {
      "word": "Second Island Chain"
    },
    {
      "word": "third island chain"
    },
    {
      "word": "Third Island Chain"
    }
  ],
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English proper nouns",
        "English terms calqued from Chinese",
        "English terms derived from Chinese",
        "English uncountable nouns",
        "en:Politics"
      ],
      "glosses": [
        "The first chain of major archipelagos out from the East Asian continental mainland coast. Principally composed of the Kuril Islands, Japanese Archipelago, Ryu Kyu Islands, Taiwan, the northern Philippines, and Borneo; from the Kamchatka Peninsula to the Malay Peninsula."
      ],
      "links": [
        [
          "politics",
          "politics"
        ],
        [
          "archipelago",
          "archipelago"
        ],
        [
          "East Asian",
          "East Asian"
        ],
        [
          "continental",
          "continental"
        ],
        [
          "mainland",
          "mainland"
        ],
        [
          "coast",
          "coast"
        ],
        [
          "Kuril Islands",
          "Kuril Islands"
        ],
        [
          "Japanese Archipelago",
          "Japanese Archipelago"
        ],
        [
          "Ryu Kyu Islands",
          "Ryu Kyu Islands"
        ],
        [
          "Taiwan",
          "Taiwan"
        ],
        [
          "Philippines",
          "Philippines"
        ],
        [
          "Borneo",
          "Borneo"
        ],
        [
          "Kamchatka Peninsula",
          "Kamchatka Peninsula"
        ],
        [
          "Malay Peninsula",
          "Malay Peninsula"
        ]
      ],
      "raw_glosses": [
        "(politics) The first chain of major archipelagos out from the East Asian continental mainland coast. Principally composed of the Kuril Islands, Japanese Archipelago, Ryu Kyu Islands, Taiwan, the northern Philippines, and Borneo; from the Kamchatka Peninsula to the Malay Peninsula."
      ],
      "topics": [
        "government",
        "politics"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "First Island Chain"
    }
  ],
  "word": "first island chain"
}