"втёмную" meaning in Russian

{
  "etymology_templates": [
    {
      "args": {
        "1": "ru",
        "2": "в-",
        "3": "тёмную"
      },
      "expansion": "в- (v-) + тёмную (tjómnuju)",
      "name": "af"
    }
  ],
  "etymology_text": "From в- (v-) + тёмную (tjómnuju).",
  "forms": [
    {
      "form": "vtjómnuju",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "втёмную"
      },
      "expansion": "втёмную • (vtjómnuju)",
      "name": "ru-adv"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "adv",
  "senses": [
    {
      "antonyms": [
        {
          "word": "всве́тлую"
        }
      ],
      "categories": [
        {
          "kind": "topical",
          "langcode": "ru",
          "name": "Card games",
          "orig": "ru:Card games",
          "parents": [
            "Games",
            "Recreation",
            "Human activity",
            "Human behaviour",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "_dis": "100 0",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "100 0",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "100 0",
          "kind": "other",
          "name": "Russian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "100 0",
          "kind": "other",
          "name": "Russian links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "100 0",
          "kind": "other",
          "name": "Russian terms prefixed with в-",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "without seeing the opponent's cards; without showing one's cards"
      ],
      "id": "en-втёмную-ru-adv-YaDLLl7r",
      "links": [
        [
          "card game",
          "card game"
        ],
        [
          "without",
          "without"
        ],
        [
          "seeing",
          "seeing"
        ],
        [
          "opponent",
          "opponent"
        ],
        [
          "card",
          "card"
        ],
        [
          "showing",
          "showing"
        ]
      ],
      "raw_glosses": [
        "(card games) without seeing the opponent's cards; without showing one's cards"
      ],
      "topics": [
        "card-games",
        "games"
      ]
    },
    {
      "categories": [],
      "examples": [
        {
          "english": "to take a leap in the dark",
          "roman": "déjstvovatʹ vtjómnuju",
          "text": "де́йствовать втёмную",
          "type": "example"
        }
      ],
      "glosses": [
        "blindly, in the dark"
      ],
      "id": "en-втёмную-ru-adv-R5zIpgKY",
      "links": [
        [
          "blindly",
          "blindly"
        ],
        [
          "in the dark",
          "in the dark"
        ]
      ],
      "raw_glosses": [
        "(colloquial) blindly, in the dark"
      ],
      "tags": [
        "colloquial"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈftʲɵmnʊjʊ]"
    },
    {
      "audio": "Ru-втёмную.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/3/3a/Ru-%D0%B2%D1%82%D1%91%D0%BC%D0%BD%D1%83%D1%8E.ogg/Ru-%D0%B2%D1%82%D1%91%D0%BC%D0%BD%D1%83%D1%8E.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/3/3a/Ru-%D0%B2%D1%82%D1%91%D0%BC%D0%BD%D1%83%D1%8E.ogg"
    }
  ],
  "word": "втёмную"
}

{
  "categories": [
    "Pages with 1 entry",
    "Pages with entries",
    "Russian 3-syllable words",
    "Russian adverbs",
    "Russian entries with incorrect language header",
    "Russian lemmas",
    "Russian links with redundant wikilinks",
    "Russian terms prefixed with в-",
    "Russian terms with IPA pronunciation",
    "Russian terms with redundant head parameter"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "ru",
        "2": "в-",
        "3": "тёмную"
      },
      "expansion": "в- (v-) + тёмную (tjómnuju)",
      "name": "af"
    }
  ],
  "etymology_text": "From в- (v-) + тёмную (tjómnuju).",
  "forms": [
    {
      "form": "vtjómnuju",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "втёмную"
      },
      "expansion": "втёмную • (vtjómnuju)",
      "name": "ru-adv"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "adv",
  "senses": [
    {
      "antonyms": [
        {
          "word": "всве́тлую"
        }
      ],
      "categories": [
        "ru:Card games"
      ],
      "glosses": [
        "without seeing the opponent's cards; without showing one's cards"
      ],
      "links": [
        [
          "card game",
          "card game"
        ],
        [
          "without",
          "without"
        ],
        [
          "seeing",
          "seeing"
        ],
        [
          "opponent",
          "opponent"
        ],
        [
          "card",
          "card"
        ],
        [
          "showing",
          "showing"
        ]
      ],
      "raw_glosses": [
        "(card games) without seeing the opponent's cards; without showing one's cards"
      ],
      "topics": [
        "card-games",
        "games"
      ]
    },
    {
      "categories": [
        "Russian colloquialisms",
        "Russian terms with usage examples"
      ],
      "examples": [
        {
          "english": "to take a leap in the dark",
          "roman": "déjstvovatʹ vtjómnuju",
          "text": "де́йствовать втёмную",
          "type": "example"
        }
      ],
      "glosses": [
        "blindly, in the dark"
      ],
      "links": [
        [
          "blindly",
          "blindly"
        ],
        [
          "in the dark",
          "in the dark"
        ]
      ],
      "raw_glosses": [
        "(colloquial) blindly, in the dark"
      ],
      "tags": [
        "colloquial"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈftʲɵmnʊjʊ]"
    },
    {
      "audio": "Ru-втёмную.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/3/3a/Ru-%D0%B2%D1%82%D1%91%D0%BC%D0%BD%D1%83%D1%8E.ogg/Ru-%D0%B2%D1%82%D1%91%D0%BC%D0%BD%D1%83%D1%8E.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/3/3a/Ru-%D0%B2%D1%82%D1%91%D0%BC%D0%BD%D1%83%D1%8E.ogg"
    }
  ],
  "word": "втёмную"
}