"по-чёрному" meaning in Russian

{
  "categories": [],
  "etymology_templates": [
    {
      "args": {
        "1": "ru",
        "2": "чёрный",
        "3": "",
        "4": "black"
      },
      "expansion": "чёрный (čórnyj, “black”)",
      "name": "m"
    },
    {
      "args": {
        "1": "de",
        "2": "schwarz"
      },
      "expansion": "German schwarz",
      "name": "cog"
    },
    {
      "args": {
        "1": "de",
        "2": "schwarzarbeiten",
        "3": "",
        "4": "to work illegally, lit.: to work black"
      },
      "expansion": "schwarzarbeiten (“to work illegally, lit.: to work black”)",
      "name": "m"
    }
  ],
  "etymology_text": "Adverbial form of чёрный (čórnyj, “black”), compare the usage in German schwarz, as in schwarzarbeiten (“to work illegally, lit.: to work black”)",
  "forms": [
    {
      "form": "po-čórnomu",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "по-чёрному"
      },
      "expansion": "по-чёрному • (po-čórnomu)",
      "name": "ru-adv"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "adv",
  "senses": [
    {
      "glosses": [
        "without a chimney when a smoke goes directly into the house"
      ],
      "id": "en-по-чёрному-ru-adv-1n-isXY7",
      "links": [
        [
          "chimney",
          "chimney"
        ]
      ],
      "raw_glosses": [
        "(of ovens) without a chimney when a smoke goes directly into the house"
      ],
      "tags": [
        "of ovens"
      ]
    },
    {
      "categories": [],
      "examples": [
        {
          "english": "to work cash in hand",
          "roman": "rabótatʹ po-čórnomu",
          "text": "рабо́тать по-чёрному",
          "type": "example"
        }
      ],
      "glosses": [
        "illegally, without a permit; secretly"
      ],
      "id": "en-по-чёрному-ru-adv-pqGb5cyb",
      "links": [
        [
          "illegally",
          "illegally"
        ],
        [
          "permit",
          "permit"
        ],
        [
          "secretly",
          "secretly"
        ]
      ],
      "raw_glosses": [
        "(colloquial) illegally, without a permit; secretly"
      ],
      "tags": [
        "colloquial"
      ]
    },
    {
      "categories": [],
      "examples": [
        {
          "text": "Их за э́то би́ли по-чёрному.\nIx za éto bíli po-čórnomu.\nThey were beaten mercilessly for that.",
          "type": "example"
        }
      ],
      "glosses": [
        "severely; cruelly; mercilessly"
      ],
      "id": "en-по-чёрному-ru-adv-MD6UIkTR",
      "links": [
        [
          "severely",
          "severely"
        ],
        [
          "cruelly",
          "cruelly"
        ],
        [
          "mercilessly",
          "mercilessly"
        ]
      ],
      "raw_glosses": [
        "(colloquial) severely; cruelly; mercilessly"
      ],
      "tags": [
        "colloquial"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[pɐ‿ˈt͡ɕɵrnəmʊ]"
    }
  ],
  "word": "по-чёрному"
}

{
  "categories": [
    "Russian adverbs",
    "Russian lemmas",
    "Russian multiword terms",
    "Russian terms with IPA pronunciation"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "ru",
        "2": "чёрный",
        "3": "",
        "4": "black"
      },
      "expansion": "чёрный (čórnyj, “black”)",
      "name": "m"
    },
    {
      "args": {
        "1": "de",
        "2": "schwarz"
      },
      "expansion": "German schwarz",
      "name": "cog"
    },
    {
      "args": {
        "1": "de",
        "2": "schwarzarbeiten",
        "3": "",
        "4": "to work illegally, lit.: to work black"
      },
      "expansion": "schwarzarbeiten (“to work illegally, lit.: to work black”)",
      "name": "m"
    }
  ],
  "etymology_text": "Adverbial form of чёрный (čórnyj, “black”), compare the usage in German schwarz, as in schwarzarbeiten (“to work illegally, lit.: to work black”)",
  "forms": [
    {
      "form": "po-čórnomu",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "по-чёрному"
      },
      "expansion": "по-чёрному • (po-čórnomu)",
      "name": "ru-adv"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "adv",
  "senses": [
    {
      "glosses": [
        "without a chimney when a smoke goes directly into the house"
      ],
      "links": [
        [
          "chimney",
          "chimney"
        ]
      ],
      "raw_glosses": [
        "(of ovens) without a chimney when a smoke goes directly into the house"
      ],
      "tags": [
        "of ovens"
      ]
    },
    {
      "categories": [
        "Russian colloquialisms",
        "Russian terms with usage examples"
      ],
      "examples": [
        {
          "english": "to work cash in hand",
          "roman": "rabótatʹ po-čórnomu",
          "text": "рабо́тать по-чёрному",
          "type": "example"
        }
      ],
      "glosses": [
        "illegally, without a permit; secretly"
      ],
      "links": [
        [
          "illegally",
          "illegally"
        ],
        [
          "permit",
          "permit"
        ],
        [
          "secretly",
          "secretly"
        ]
      ],
      "raw_glosses": [
        "(colloquial) illegally, without a permit; secretly"
      ],
      "tags": [
        "colloquial"
      ]
    },
    {
      "categories": [
        "Russian colloquialisms",
        "Russian terms with usage examples"
      ],
      "examples": [
        {
          "text": "Их за э́то би́ли по-чёрному.\nIx za éto bíli po-čórnomu.\nThey were beaten mercilessly for that.",
          "type": "example"
        }
      ],
      "glosses": [
        "severely; cruelly; mercilessly"
      ],
      "links": [
        [
          "severely",
          "severely"
        ],
        [
          "cruelly",
          "cruelly"
        ],
        [
          "mercilessly",
          "mercilessly"
        ]
      ],
      "raw_glosses": [
        "(colloquial) severely; cruelly; mercilessly"
      ],
      "tags": [
        "colloquial"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[pɐ‿ˈt͡ɕɵrnəmʊ]"
    }
  ],
  "word": "по-чёрному"
}