"赤線" meaning in Japanese

{
  "forms": [
    {
      "form": "赤線",
      "ruby": [
        [
          "赤",
          "あか"
        ],
        [
          "線",
          "せん"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "akasen",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "あかせん"
      },
      "expansion": "赤(あか)線(せん) • (akasen)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "related": [
    {
      "_dis1": "0 0",
      "roman": "aosen",
      "ruby": [
        [
          "青線",
          "あおせん"
        ]
      ],
      "word": "青線"
    }
  ],
  "senses": [
    {
      "categories": [
        {
          "_dis": "68 32",
          "kind": "other",
          "name": "Japanese terms with 2 kanji",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "red line"
      ],
      "id": "en-赤線-ja-noun-oLzJa42N",
      "links": [
        [
          "red",
          "red"
        ],
        [
          "line",
          "line"
        ]
      ]
    },
    {
      "alt_of": [
        {
          "extra": "(akasenchitai): Akasen (districts in Japan where prostitution and the sex industry flourished)",
          "word": "赤線地帯(あかせんちたい)"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Japanese terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "_dis": "15 85",
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "13 87",
          "kind": "other",
          "name": "Japanese links with redundant alt parameters",
          "parents": [
            "Links with redundant alt parameters",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "13 87",
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "13 87",
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [
            "Terms with redundant sortkeys",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "10 90",
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "6 94",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Short for 赤線地帯(あかせんちたい) (akasenchitai): Akasen (districts in Japan where prostitution and the sex industry flourished)"
      ],
      "id": "en-赤線-ja-noun-PBAtTorW",
      "links": [
        [
          "赤線地帯(あかせんちたい)",
          "赤線地帯#Japanese"
        ]
      ],
      "raw_glosses": [
        "(historical) Short for 赤線地帯(あかせんちたい) (akasenchitai): Akasen (districts in Japan where prostitution and the sex industry flourished)"
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "historical"
      ]
    }
  ],
  "sounds": [
    {
      "other": "あかせん"
    },
    {
      "ipa": "[a̠ka̠sẽ̞ɴ]"
    }
  ],
  "wikipedia": [
    "ja:赤線"
  ],
  "word": "赤線"
}

{
  "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 first grade kanji",
    "Japanese terms spelled with second grade kanji",
    "Japanese terms with 2 kanji",
    "Japanese terms with IPA pronunciation",
    "Japanese terms with redundant sortkeys",
    "Pages with 2 entries",
    "Pages with entries"
  ],
  "forms": [
    {
      "form": "赤線",
      "ruby": [
        [
          "赤",
          "あか"
        ],
        [
          "線",
          "せん"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "akasen",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "あかせん"
      },
      "expansion": "赤(あか)線(せん) • (akasen)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "related": [
    {
      "roman": "aosen",
      "ruby": [
        [
          "青線",
          "あおせん"
        ]
      ],
      "word": "青線"
    }
  ],
  "senses": [
    {
      "glosses": [
        "red line"
      ],
      "links": [
        [
          "red",
          "red"
        ],
        [
          "line",
          "line"
        ]
      ]
    },
    {
      "alt_of": [
        {
          "extra": "(akasenchitai): Akasen (districts in Japan where prostitution and the sex industry flourished)",
          "word": "赤線地帯(あかせんちたい)"
        }
      ],
      "categories": [
        "Japanese terms with historical senses",
        "Japanese terms with non-redundant non-automated sortkeys"
      ],
      "glosses": [
        "Short for 赤線地帯(あかせんちたい) (akasenchitai): Akasen (districts in Japan where prostitution and the sex industry flourished)"
      ],
      "links": [
        [
          "赤線地帯(あかせんちたい)",
          "赤線地帯#Japanese"
        ]
      ],
      "raw_glosses": [
        "(historical) Short for 赤線地帯(あかせんちたい) (akasenchitai): Akasen (districts in Japan where prostitution and the sex industry flourished)"
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "historical"
      ]
    }
  ],
  "sounds": [
    {
      "other": "あかせん"
    },
    {
      "ipa": "[a̠ka̠sẽ̞ɴ]"
    }
  ],
  "wikipedia": [
    "ja:赤線"
  ],
  "word": "赤線"
}

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

{
  "called_from": "form_descriptions/2278",
  "msg": "suspicious alt_of/form_of with '(': 赤線地帯(あかせんちたい)",
  "path": [
    "赤線"
  ],
  "section": "Japanese",
  "subsection": "noun",
  "title": "赤線",
  "trace": ""
}