"luyện ngục" meaning in Vietnamese

{
  "etymology_templates": [
    {
      "args": {
        "1": "vi",
        "2": "煉獄"
      },
      "expansion": "",
      "name": "etymid"
    },
    {
      "args": {
        "1": "vi",
        "2": "Sino-Vietnamese words"
      },
      "expansion": "",
      "name": "categorize"
    },
    {
      "args": {
        "1": "煉",
        "2": "to temper",
        "3": "獄",
        "4": "prison"
      },
      "expansion": "Sino-Vietnamese word from 煉獄, composed of 煉 (“to temper”) and 獄 (“prison”)",
      "name": "vi-etym-sino"
    }
  ],
  "etymology_text": "Sino-Vietnamese word from 煉獄, composed of 煉 (“to temper”) and 獄 (“prison”)",
  "head_templates": [
    {
      "args": {
        "1": "vi",
        "2": "noun",
        "3": "",
        "4": "",
        "head": "",
        "tr": ""
      },
      "expansion": "luyện ngục",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "luyện ngục",
      "name": "vi-noun"
    }
  ],
  "lang": "Vietnamese",
  "lang_code": "vi",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Sino-Vietnamese words",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Vietnamese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "vi",
          "name": "Afterlife",
          "orig": "vi:Afterlife",
          "parents": [
            "Death",
            "Mythology",
            "Philosophy",
            "Religion",
            "Body",
            "Life",
            "Culture",
            "All topics",
            "Nature",
            "Society",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "vi",
          "name": "Mythological locations",
          "orig": "vi:Mythological locations",
          "parents": [
            "Mythology",
            "Culture",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "vi",
          "name": "Roman Catholicism",
          "orig": "vi:Roman Catholicism",
          "parents": [
            "Catholicism",
            "Christianity",
            "Abrahamism",
            "Religion",
            "Culture",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "purgatory"
      ],
      "id": "en-luyện_ngục-vi-noun-2Q1FyepN",
      "links": [
        [
          "purgatory",
          "purgatory#English"
        ]
      ],
      "related": [
        {
          "word": "địa ngục"
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[lwiən˧˨ʔ ŋʊwk͡p̚˧˨ʔ]",
      "tags": [
        "Hà-Nội"
      ]
    },
    {
      "ipa": "[lwiəŋ˨˩ʔ ŋʊwk͡p̚˨˩ʔ]",
      "tags": [
        "Huế"
      ]
    },
    {
      "ipa": "[l⁽ʷ⁾iəŋ˨˩˨ ŋʊwk͡p̚˨˩˨]",
      "note": "Saigon"
    }
  ],
  "word": "luyện ngục"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "vi",
        "2": "煉獄"
      },
      "expansion": "",
      "name": "etymid"
    },
    {
      "args": {
        "1": "vi",
        "2": "Sino-Vietnamese words"
      },
      "expansion": "",
      "name": "categorize"
    },
    {
      "args": {
        "1": "煉",
        "2": "to temper",
        "3": "獄",
        "4": "prison"
      },
      "expansion": "Sino-Vietnamese word from 煉獄, composed of 煉 (“to temper”) and 獄 (“prison”)",
      "name": "vi-etym-sino"
    }
  ],
  "etymology_text": "Sino-Vietnamese word from 煉獄, composed of 煉 (“to temper”) and 獄 (“prison”)",
  "head_templates": [
    {
      "args": {
        "1": "vi",
        "2": "noun",
        "3": "",
        "4": "",
        "head": "",
        "tr": ""
      },
      "expansion": "luyện ngục",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "luyện ngục",
      "name": "vi-noun"
    }
  ],
  "lang": "Vietnamese",
  "lang_code": "vi",
  "pos": "noun",
  "related": [
    {
      "word": "địa ngục"
    }
  ],
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Sino-Vietnamese words",
        "Vietnamese entries with incorrect language header",
        "Vietnamese lemmas",
        "Vietnamese nouns",
        "Vietnamese terms with IPA pronunciation",
        "vi:Afterlife",
        "vi:Mythological locations",
        "vi:Roman Catholicism"
      ],
      "glosses": [
        "purgatory"
      ],
      "links": [
        [
          "purgatory",
          "purgatory#English"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[lwiən˧˨ʔ ŋʊwk͡p̚˧˨ʔ]",
      "tags": [
        "Hà-Nội"
      ]
    },
    {
      "ipa": "[lwiəŋ˨˩ʔ ŋʊwk͡p̚˨˩ʔ]",
      "tags": [
        "Huế"
      ]
    },
    {
      "ipa": "[l⁽ʷ⁾iəŋ˨˩˨ ŋʊwk͡p̚˨˩˨]",
      "note": "Saigon"
    }
  ],
  "word": "luyện ngục"
}