"officer down" meaning in English

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  "lang_code": "en",
  "pos": "phrase",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Law enforcement",
          "orig": "en:Law enforcement",
          "parents": [
            "Crime prevention",
            "Emergency services",
            "Law",
            "Crime",
            "Public safety",
            "Justice",
            "Criminal law",
            "Society",
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            "Government",
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      "glosses": [
        "A police officer has been critically wounded, incapacitated, or killed."
      ],
      "id": "en-officer_down-en-phrase-0golTw89",
      "links": [
        [
          "law enforcement",
          "law enforcement"
        ],
        [
          "police officer",
          "police officer"
        ]
      ],
      "raw_glosses": [
        "(law enforcement) A police officer has been critically wounded, incapacitated, or killed."
      ],
      "topics": [
        "government",
        "law-enforcement"
      ]
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  "word": "officer down"
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  "lang_code": "en",
  "pos": "phrase",
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      "glosses": [
        "A police officer has been critically wounded, incapacitated, or killed."
      ],
      "links": [
        [
          "law enforcement",
          "law enforcement"
        ],
        [
          "police officer",
          "police officer"
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        "(law enforcement) A police officer has been critically wounded, incapacitated, or killed."
      ],
      "topics": [
        "government",
        "law-enforcement"
      ]
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  "word": "officer down"
}