"underground" meaning in 영어

{
  "categories": [
    {
      "kind": "other",
      "name": "영어 명사",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "under + ground"
  ],
  "lang": "영어",
  "lang_code": "en",
  "pos": "unknown",
  "senses": [
    {
      "examples": [
        {
          "text": "an underground qroup of anti-goverment guerillas 반정부 게릴라들의 비밀 단체"
        }
      ],
      "glosses": [
        "지하철"
      ],
      "id": "ko-underground-en-unknown-37jHO58E"
    }
  ],
  "word": "underground"
}

{
  "categories": [
    "영어 명사"
  ],
  "etymology_texts": [
    "under + ground"
  ],
  "lang": "영어",
  "lang_code": "en",
  "pos": "unknown",
  "senses": [
    {
      "examples": [
        {
          "text": "an underground qroup of anti-goverment guerillas 반정부 게릴라들의 비밀 단체"
        }
      ],
      "glosses": [
        "지하철"
      ]
    }
  ],
  "word": "underground"
}