"ambulance cover" meaning in English

{
  "forms": [
    {
      "form": "ambulance covers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "ambulance cover (plural ambulance covers)",
      "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": "Philately",
          "orig": "en:Philately",
          "parents": [
            "Hobbies",
            "Recreation",
            "Human activity",
            "Human behaviour",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "An envelope used by the postal authorities to convey a letter damaged during sorting."
      ],
      "id": "en-ambulance_cover-en-noun-pGVWZCGN",
      "links": [
        [
          "philately",
          "philately"
        ],
        [
          "envelope",
          "envelope"
        ],
        [
          "postal authorities",
          "postal authority"
        ],
        [
          "convey",
          "convey"
        ],
        [
          "damaged",
          "damaged"
        ],
        [
          "sorting",
          "sorting"
        ]
      ],
      "raw_glosses": [
        "(philately, informal) An envelope used by the postal authorities to convey a letter damaged during sorting."
      ],
      "tags": [
        "informal"
      ],
      "topics": [
        "hobbies",
        "lifestyle",
        "philately"
      ]
    }
  ],
  "word": "ambulance cover"
}

{
  "forms": [
    {
      "form": "ambulance covers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "ambulance cover (plural ambulance covers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English informal terms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Philately"
      ],
      "glosses": [
        "An envelope used by the postal authorities to convey a letter damaged during sorting."
      ],
      "links": [
        [
          "philately",
          "philately"
        ],
        [
          "envelope",
          "envelope"
        ],
        [
          "postal authorities",
          "postal authority"
        ],
        [
          "convey",
          "convey"
        ],
        [
          "damaged",
          "damaged"
        ],
        [
          "sorting",
          "sorting"
        ]
      ],
      "raw_glosses": [
        "(philately, informal) An envelope used by the postal authorities to convey a letter damaged during sorting."
      ],
      "tags": [
        "informal"
      ],
      "topics": [
        "hobbies",
        "lifestyle",
        "philately"
      ]
    }
  ],
  "word": "ambulance cover"
}