"active service" meaning in English

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      "expansion": "active service (uncountable)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "British English",
          "parents": [],
          "source": "w"
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          "kind": "other",
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          "parents": [],
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Military",
          "orig": "en:Military",
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            "Society",
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            "Fundamental"
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          "source": "w"
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      "examples": [
        {
          "ref": "1947 January and February, “Notes and News: New Southern Channel Steamer”, in Railway Magazine, page 49:",
          "text": "She was built by William Denny & Bros. Ltd., and launched in 1939, but went immediately on active service as a trooper [troopship].",
          "type": "quote"
        }
      ],
      "glosses": [
        "Full-time occupation in the military."
      ],
      "id": "en-active_service-en-noun-rENTPXj-",
      "links": [
        [
          "military",
          "military"
        ],
        [
          "Full-time",
          "full-time"
        ],
        [
          "occupation",
          "occupation"
        ]
      ],
      "raw_glosses": [
        "(UK, military) Full-time occupation in the military."
      ],
      "synonyms": [
        {
          "word": "active duty"
        }
      ],
      "tags": [
        "UK",
        "uncountable"
      ],
      "topics": [
        "government",
        "military",
        "politics",
        "war"
      ],
      "wikipedia": [
        "active duty"
      ]
    }
  ],
  "word": "active service"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
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      "expansion": "active service (uncountable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        {
          "ref": "1947 January and February, “Notes and News: New Southern Channel Steamer”, in Railway Magazine, page 49:",
          "text": "She was built by William Denny & Bros. Ltd., and launched in 1939, but went immediately on active service as a trooper [troopship].",
          "type": "quote"
        }
      ],
      "glosses": [
        "Full-time occupation in the military."
      ],
      "links": [
        [
          "military",
          "military"
        ],
        [
          "Full-time",
          "full-time"
        ],
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          "occupation",
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        ]
      ],
      "raw_glosses": [
        "(UK, military) Full-time occupation in the military."
      ],
      "synonyms": [
        {
          "word": "active duty"
        }
      ],
      "tags": [
        "UK",
        "uncountable"
      ],
      "topics": [
        "government",
        "military",
        "politics",
        "war"
      ],
      "wikipedia": [
        "active duty"
      ]
    }
  ],
  "word": "active service"
}