"drop zone" meaning in English

{
  "forms": [
    {
      "form": "drop zones",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "drop zone (plural drop zones)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "dropzone"
        }
      ],
      "glosses": [
        "Alternative spelling of dropzone"
      ],
      "id": "en-drop_zone-en-noun--vmlB0Lh",
      "links": [
        [
          "dropzone",
          "dropzone#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    },
    {
      "categories": [
        {
          "_dis": "22 78",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "ref": "2011 January 5, Mark Ashenden, “Wolverhampton 1 - 0 Chelsea”, in BBC",
          "text": "Wolves rose out of the drop zone with a deserved win to add more pressure on to defending champions Chelsea.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "relegation zone"
      ],
      "id": "en-drop_zone-en-noun-JzR0yOAL",
      "links": [
        [
          "relegation zone",
          "relegation zone"
        ]
      ]
    }
  ],
  "word": "drop zone"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns"
  ],
  "forms": [
    {
      "form": "drop zones",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "drop zone (plural drop zones)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "dropzone"
        }
      ],
      "glosses": [
        "Alternative spelling of dropzone"
      ],
      "links": [
        [
          "dropzone",
          "dropzone#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    },
    {
      "categories": [
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2011 January 5, Mark Ashenden, “Wolverhampton 1 - 0 Chelsea”, in BBC",
          "text": "Wolves rose out of the drop zone with a deserved win to add more pressure on to defending champions Chelsea.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "relegation zone"
      ],
      "links": [
        [
          "relegation zone",
          "relegation zone"
        ]
      ]
    }
  ],
  "word": "drop zone"
}