"救命胴衣" meaning in Japanese

{
  "forms": [
    {
      "form": "救命胴衣",
      "ruby": [
        [
          "救",
          "きゅう"
        ],
        [
          "命",
          "めい"
        ],
        [
          "胴",
          "どう"
        ],
        [
          "衣",
          "い"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "kyūmei dōi",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "kiumei doui",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "きうめいどうい",
      "roman": "kiumei doui",
      "tags": [
        "hiragana",
        "historical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "きゅうめい どうい",
        "hhira": "きうめい どうい"
      },
      "expansion": "救(きゅう)命(めい)胴(どう)衣(い) • (kyūmei dōi) ^(←きうめいどうい (kiumei doui)?)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant alt parameters",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with 4 kanji",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with Nakadaka pitch accent (Tōkyō)",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with multiple readings",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "life jacket"
      ],
      "id": "en-救命胴衣-ja-noun-gZZSYqwz",
      "links": [
        [
          "life jacket",
          "life jacket"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "other": "きゅうめーどーい"
    },
    {
      "ipa": "[kʲɨːme̞ː do̞ːi]"
    }
  ],
  "word": "救命胴衣"
}

{
  "forms": [
    {
      "form": "救命胴衣",
      "ruby": [
        [
          "救",
          "きゅう"
        ],
        [
          "命",
          "めい"
        ],
        [
          "胴",
          "どう"
        ],
        [
          "衣",
          "い"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "kyūmei dōi",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "kiumei doui",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "きうめいどうい",
      "roman": "kiumei doui",
      "tags": [
        "hiragana",
        "historical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "きゅうめい どうい",
        "hhira": "きうめい どうい"
      },
      "expansion": "救(きゅう)命(めい)胴(どう)衣(い) • (kyūmei dōi) ^(←きうめいどうい (kiumei doui)?)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Japanese entries with incorrect language header",
        "Japanese lemmas",
        "Japanese links with redundant alt parameters",
        "Japanese links with redundant wikilinks",
        "Japanese nouns",
        "Japanese terms spelled with fifth grade kanji",
        "Japanese terms spelled with fourth grade kanji",
        "Japanese terms spelled with secondary school kanji",
        "Japanese terms spelled with third grade kanji",
        "Japanese terms with 4 kanji",
        "Japanese terms with IPA pronunciation",
        "Japanese terms with Nakadaka pitch accent (Tōkyō)",
        "Japanese terms with multiple readings",
        "Japanese terms with redundant sortkeys",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "life jacket"
      ],
      "links": [
        [
          "life jacket",
          "life jacket"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "other": "きゅうめーどーい"
    },
    {
      "ipa": "[kʲɨːme̞ː do̞ːi]"
    }
  ],
  "word": "救命胴衣"
}

{
  "called_from": "parser/304",
  "msg": "HTML tag <span> not properly closed",
  "path": [
    "救命胴衣"
  ],
  "section": "Japanese",
  "subsection": "noun",
  "title": "救命胴衣",
  "trace": "started on line 2, detected on line 2"
}

{
  "called_from": "parser/1336",
  "msg": "no corresponding start tag found for </span>",
  "path": [
    "救命胴衣"
  ],
  "section": "Japanese",
  "subsection": "noun",
  "title": "救命胴衣",
  "trace": ""
}