"sound truck" meaning in English

{
  "forms": [
    {
      "form": "sound trucks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sound truck (plural sound trucks)",
      "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"
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          "source": "w"
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          "name": "Terms with German translations",
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Vehicles",
          "orig": "en:Vehicles",
          "parents": [
            "Machines",
            "Transport",
            "Technology",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A vehicle equipped with loudspeakers, used for advertising, safety announcements, etc."
      ],
      "id": "en-sound_truck-en-noun-DsO-JTna",
      "links": [
        [
          "vehicle",
          "vehicle"
        ],
        [
          "loudspeaker",
          "loudspeaker"
        ],
        [
          "advertising",
          "advertising"
        ]
      ],
      "translations": [
        {
          "code": "de",
          "lang": "German",
          "sense": "vehicle equipped with loudspeakers",
          "tags": [
            "masculine"
          ],
          "word": "Lautsprecherwagen"
        }
      ],
      "wikipedia": [
        "sound truck"
      ]
    }
  ],
  "word": "sound truck"
}

{
  "forms": [
    {
      "form": "sound trucks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sound truck (plural sound trucks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
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        "Pages with 1 entry",
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        "en:Vehicles"
      ],
      "glosses": [
        "A vehicle equipped with loudspeakers, used for advertising, safety announcements, etc."
      ],
      "links": [
        [
          "vehicle",
          "vehicle"
        ],
        [
          "loudspeaker",
          "loudspeaker"
        ],
        [
          "advertising",
          "advertising"
        ]
      ],
      "wikipedia": [
        "sound truck"
      ]
    }
  ],
  "translations": [
    {
      "code": "de",
      "lang": "German",
      "sense": "vehicle equipped with loudspeakers",
      "tags": [
        "masculine"
      ],
      "word": "Lautsprecherwagen"
    }
  ],
  "word": "sound truck"
}