"bridge of no return" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "ko",
        "3": "돌아올 수 없는 다리"
      },
      "expansion": "Calque of Korean 돌아올 수 없는 다리 (doraol su eomneun dari)",
      "name": "cal"
    }
  ],
  "etymology_text": "Calque of Korean 돌아올 수 없는 다리 (doraol su eomneun dari)",
  "head_templates": [
    {
      "args": {},
      "expansion": "bridge of no return",
      "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": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1988, John S. Edwards, editor, American Ex-prisoners of War: Non Solum Armis, Turner Publishing Company, →ISBN, page 32:",
          "text": "Three birthdays and 28 months later I was released at Panmunjom when the war ended and crossed the Bridge of No Return to rejoin the human race.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A bridge crossing the military demarcation line between North Korea and South Korea."
      ],
      "id": "en-bridge_of_no_return-en-name-JNp6fFh0",
      "links": [
        [
          "demarcation line",
          "demarcation line"
        ],
        [
          "North Korea",
          "North Korea"
        ],
        [
          "South Korea",
          "South Korea"
        ]
      ]
    }
  ],
  "word": "bridge of no return"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "ko",
        "3": "돌아올 수 없는 다리"
      },
      "expansion": "Calque of Korean 돌아올 수 없는 다리 (doraol su eomneun dari)",
      "name": "cal"
    }
  ],
  "etymology_text": "Calque of Korean 돌아올 수 없는 다리 (doraol su eomneun dari)",
  "head_templates": [
    {
      "args": {},
      "expansion": "bridge of no return",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English proper nouns",
        "English terms calqued from Korean",
        "English terms derived from Korean",
        "English terms with quotations",
        "English uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "ref": "1988, John S. Edwards, editor, American Ex-prisoners of War: Non Solum Armis, Turner Publishing Company, →ISBN, page 32:",
          "text": "Three birthdays and 28 months later I was released at Panmunjom when the war ended and crossed the Bridge of No Return to rejoin the human race.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A bridge crossing the military demarcation line between North Korea and South Korea."
      ],
      "links": [
        [
          "demarcation line",
          "demarcation line"
        ],
        [
          "North Korea",
          "North Korea"
        ],
        [
          "South Korea",
          "South Korea"
        ]
      ]
    }
  ],
  "word": "bridge of no return"
}