"blue line" meaning in English

{
  "forms": [
    {
      "form": "blue lines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "blue line (plural blue lines)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "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": "Ice hockey",
          "orig": "en:Ice hockey",
          "parents": [
            "Hockey",
            "Winter sports",
            "Sports",
            "Winter activities",
            "Human activity",
            "Winter",
            "Human behaviour",
            "Seasons",
            "Human",
            "Nature",
            "Periodic occurrences",
            "All topics",
            "Time",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "Coordinate term: red line"
        }
      ],
      "glosses": [
        "Either of the two thick blue lines on the ice that separate an attacking zone or defending zone from the neutral zone."
      ],
      "id": "en-blue_line-en-noun-aEAVazTf",
      "links": [
        [
          "ice hockey",
          "ice hockey"
        ],
        [
          "ice",
          "ice"
        ],
        [
          "attacking zone",
          "attacking zone"
        ],
        [
          "defending zone",
          "defending zone"
        ],
        [
          "neutral zone",
          "neutral zone"
        ]
      ],
      "raw_glosses": [
        "(ice hockey) Either of the two thick blue lines on the ice that separate an attacking zone or defending zone from the neutral zone."
      ],
      "related": [
        {
          "word": "thin blue line"
        }
      ],
      "topics": [
        "hobbies",
        "ice-hockey",
        "lifestyle",
        "skating",
        "sports"
      ],
      "translations": [
        {
          "code": "ar",
          "lang": "Arabic",
          "roman": "ḵaṭṭ ʔazraq",
          "sense": "ice hockey: line",
          "tags": [
            "masculine"
          ],
          "word": "خَطّ أَزْرَق"
        },
        {
          "code": "cs",
          "lang": "Czech",
          "sense": "ice hockey: line",
          "tags": [
            "feminine"
          ],
          "word": "modrá čára"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "ice hockey: line",
          "word": "siniviiva"
        },
        {
          "code": "nb",
          "lang": "Norwegian Bokmål",
          "sense": "ice hockey: line",
          "tags": [
            "feminine",
            "masculine"
          ],
          "word": "blålinje"
        },
        {
          "code": "nb",
          "lang": "Norwegian Bokmål",
          "sense": "ice hockey: line",
          "word": "blue line"
        },
        {
          "code": "sv",
          "lang": "Swedish",
          "sense": "ice hockey: line",
          "tags": [
            "common-gender"
          ],
          "word": "blålinje"
        }
      ]
    }
  ],
  "word": "blue line"
}

{
  "forms": [
    {
      "form": "blue lines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "blue line (plural blue lines)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "thin blue line"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Ice hockey"
      ],
      "examples": [
        {
          "text": "Coordinate term: red line"
        }
      ],
      "glosses": [
        "Either of the two thick blue lines on the ice that separate an attacking zone or defending zone from the neutral zone."
      ],
      "links": [
        [
          "ice hockey",
          "ice hockey"
        ],
        [
          "ice",
          "ice"
        ],
        [
          "attacking zone",
          "attacking zone"
        ],
        [
          "defending zone",
          "defending zone"
        ],
        [
          "neutral zone",
          "neutral zone"
        ]
      ],
      "raw_glosses": [
        "(ice hockey) Either of the two thick blue lines on the ice that separate an attacking zone or defending zone from the neutral zone."
      ],
      "topics": [
        "hobbies",
        "ice-hockey",
        "lifestyle",
        "skating",
        "sports"
      ]
    }
  ],
  "translations": [
    {
      "code": "ar",
      "lang": "Arabic",
      "roman": "ḵaṭṭ ʔazraq",
      "sense": "ice hockey: line",
      "tags": [
        "masculine"
      ],
      "word": "خَطّ أَزْرَق"
    },
    {
      "code": "cs",
      "lang": "Czech",
      "sense": "ice hockey: line",
      "tags": [
        "feminine"
      ],
      "word": "modrá čára"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "ice hockey: line",
      "word": "siniviiva"
    },
    {
      "code": "nb",
      "lang": "Norwegian Bokmål",
      "sense": "ice hockey: line",
      "tags": [
        "feminine",
        "masculine"
      ],
      "word": "blålinje"
    },
    {
      "code": "nb",
      "lang": "Norwegian Bokmål",
      "sense": "ice hockey: line",
      "word": "blue line"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "ice hockey: line",
      "tags": [
        "common-gender"
      ],
      "word": "blålinje"
    }
  ],
  "word": "blue line"
}