"fog signal" meaning in English

{
  "forms": [
    {
      "form": "fog signals",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "fog signal (plural fog signals)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "British English",
          "parents": [],
          "source": "w"
        },
        {
          "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"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Rail transportation",
          "orig": "en:Rail transportation",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1943 November and December, T. Lovatt Williams, “Some Reminiscences of the Footplate—III”, in Railway Magazine, page 344:",
          "text": "The layman does not realise the dreadful nightmare of running in fog, especially at night, when the safety of everyone depends on the driver hearing the fog signal detonate.",
          "type": "quote"
        },
        {
          "ref": "1960 November, L. Hyland, “The Irish Scene”, in Trains Illustrated, page 691:",
          "text": "The last train—a three-coach A.E.C. unit—from Belfast to Crumlin and back, was bade farewell with fog signals as it carried a capacity crowd of last-trip travellers.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A small explosive charge (detonator) which can be placed on a railway line in fog, to be detonated by a train passing over it as a warning signal to the driver."
      ],
      "id": "en-fog_signal-en-noun-L4ckA3fQ",
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "detonator",
          "detonator"
        ]
      ],
      "raw_glosses": [
        "(rail transport, UK) A small explosive charge (detonator) which can be placed on a railway line in fog, to be detonated by a train passing over it as a warning signal to the driver."
      ],
      "tags": [
        "UK"
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "fog signal"
}

{
  "forms": [
    {
      "form": "fog signals",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "fog signal (plural fog signals)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "British English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Rail transportation"
      ],
      "examples": [
        {
          "ref": "1943 November and December, T. Lovatt Williams, “Some Reminiscences of the Footplate—III”, in Railway Magazine, page 344:",
          "text": "The layman does not realise the dreadful nightmare of running in fog, especially at night, when the safety of everyone depends on the driver hearing the fog signal detonate.",
          "type": "quote"
        },
        {
          "ref": "1960 November, L. Hyland, “The Irish Scene”, in Trains Illustrated, page 691:",
          "text": "The last train—a three-coach A.E.C. unit—from Belfast to Crumlin and back, was bade farewell with fog signals as it carried a capacity crowd of last-trip travellers.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A small explosive charge (detonator) which can be placed on a railway line in fog, to be detonated by a train passing over it as a warning signal to the driver."
      ],
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "detonator",
          "detonator"
        ]
      ],
      "raw_glosses": [
        "(rail transport, UK) A small explosive charge (detonator) which can be placed on a railway line in fog, to be detonated by a train passing over it as a warning signal to the driver."
      ],
      "tags": [
        "UK"
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "fog signal"
}