"tối hậu thư" meaning in Vietnamese

{
  "etymology_templates": [
    {
      "args": {
        "1": "vi",
        "2": "Sino-Vietnamese words"
      },
      "expansion": "",
      "name": "categorize"
    },
    {
      "args": {
        "1": "最後",
        "2": "last",
        "3": "書",
        "4": "document"
      },
      "expansion": "Sino-Vietnamese word from 最後書, composed of 最後 (“last”) and 書 (“document”)",
      "name": "vi-etym-sino"
    }
  ],
  "etymology_text": "Sino-Vietnamese word from 最後書, composed of 最後 (“last”) and 書 (“document”), with thư interpreted as \"letter\"",
  "forms": [
    {
      "form": "最後書",
      "tags": [
        "CJK"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "vi",
        "2": "noun",
        "3": "",
        "4": "",
        "head": "",
        "tr": "最後書"
      },
      "expansion": "tối hậu thư • (最後書)",
      "name": "head"
    },
    {
      "args": {
        "1": "最後書"
      },
      "expansion": "tối hậu thư • (最後書)",
      "name": "vi-noun"
    }
  ],
  "lang": "Vietnamese",
  "lang_code": "vi",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Sino-Vietnamese words",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Vietnamese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "vi",
          "name": "Directives",
          "orig": "vi:Directives",
          "parents": [
            "Communication",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "vi",
          "name": "War",
          "orig": "vi:War",
          "parents": [
            "Conflict",
            "Military",
            "Violence",
            "Human behaviour",
            "Society",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "an ultimatum"
      ],
      "id": "en-tối_hậu_thư-vi-noun-OXpC70gw",
      "links": [
        [
          "ultimatum",
          "ultimatum#English"
        ]
      ],
      "raw_glosses": [
        "(chiefly in war) an ultimatum"
      ],
      "raw_tags": [
        "in war"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[toj˧˦ həw˧˨ʔ tʰɨ˧˧]",
      "tags": [
        "Hà-Nội"
      ]
    },
    {
      "ipa": "[toj˨˩˦ həw˨˩ʔ tʰɨ˧˧]",
      "tags": [
        "Huế"
      ]
    },
    {
      "ipa": "[toj˦˥ həw˨˩˨ tʰɨ˧˧]",
      "note": "Saigon"
    }
  ],
  "word": "tối hậu thư"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "vi",
        "2": "Sino-Vietnamese words"
      },
      "expansion": "",
      "name": "categorize"
    },
    {
      "args": {
        "1": "最後",
        "2": "last",
        "3": "書",
        "4": "document"
      },
      "expansion": "Sino-Vietnamese word from 最後書, composed of 最後 (“last”) and 書 (“document”)",
      "name": "vi-etym-sino"
    }
  ],
  "etymology_text": "Sino-Vietnamese word from 最後書, composed of 最後 (“last”) and 書 (“document”), with thư interpreted as \"letter\"",
  "forms": [
    {
      "form": "最後書",
      "tags": [
        "CJK"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "vi",
        "2": "noun",
        "3": "",
        "4": "",
        "head": "",
        "tr": "最後書"
      },
      "expansion": "tối hậu thư • (最後書)",
      "name": "head"
    },
    {
      "args": {
        "1": "最後書"
      },
      "expansion": "tối hậu thư • (最後書)",
      "name": "vi-noun"
    }
  ],
  "lang": "Vietnamese",
  "lang_code": "vi",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Sino-Vietnamese words",
        "Vietnamese entries with incorrect language header",
        "Vietnamese lemmas",
        "Vietnamese nouns",
        "Vietnamese terms with IPA pronunciation",
        "vi:Directives",
        "vi:War"
      ],
      "glosses": [
        "an ultimatum"
      ],
      "links": [
        [
          "ultimatum",
          "ultimatum#English"
        ]
      ],
      "raw_glosses": [
        "(chiefly in war) an ultimatum"
      ],
      "raw_tags": [
        "in war"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[toj˧˦ həw˧˨ʔ tʰɨ˧˧]",
      "tags": [
        "Hà-Nội"
      ]
    },
    {
      "ipa": "[toj˨˩˦ həw˨˩ʔ tʰɨ˧˧]",
      "tags": [
        "Huế"
      ]
    },
    {
      "ipa": "[toj˦˥ həw˨˩˨ tʰɨ˧˧]",
      "note": "Saigon"
    }
  ],
  "word": "tối hậu thư"
}