"air horn" meaning in English

{
  "forms": [
    {
      "form": "air horns",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "air horn (plural air horns)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "airhorn"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1944 January and February, “Chime Whistles and Horns”, in Railway Magazine, page 2",
          "text": "For use with petrol-electric, and subsequently diesel-electric, vehicles, air horns were developed about 1918, and today they vary from single-note instruments to those producing as many as five chiming pitches.",
          "type": "quotation"
        },
        {
          "ref": "1962 March, Brian Haresnape, “Design in 1961—a Retrospect”, in Modern Railways, page 191",
          "text": "At a later date in production, the Western Region requested that the two-tone air horns should be placed on the cab roof instead of behind the buffer beam, in order to increase audibility.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of airhorn"
      ],
      "id": "en-air_horn-en-noun-iztLHpKy",
      "links": [
        [
          "airhorn",
          "airhorn#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "air horn"
}

{
  "forms": [
    {
      "form": "air horns",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "air horn (plural air horns)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "airhorn"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1944 January and February, “Chime Whistles and Horns”, in Railway Magazine, page 2",
          "text": "For use with petrol-electric, and subsequently diesel-electric, vehicles, air horns were developed about 1918, and today they vary from single-note instruments to those producing as many as five chiming pitches.",
          "type": "quotation"
        },
        {
          "ref": "1962 March, Brian Haresnape, “Design in 1961—a Retrospect”, in Modern Railways, page 191",
          "text": "At a later date in production, the Western Region requested that the two-tone air horns should be placed on the cab roof instead of behind the buffer beam, in order to increase audibility.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of airhorn"
      ],
      "links": [
        [
          "airhorn",
          "airhorn#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "air horn"
}