"украдкой" meaning in Russian

{
  "forms": [
    {
      "form": "укра́дкой",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "ukrádkoj",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "укра́дкой"
      },
      "expansion": "укра́дкой • (ukrádkoj)",
      "name": "ru-adv"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "_dis": "50 50",
          "kind": "other",
          "name": "Russian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "furtively"
      ],
      "id": "en-украдкой-ru-adv-YYFQgLJx",
      "links": [
        [
          "furtively",
          "furtively"
        ]
      ]
    },
    {
      "categories": [
        {
          "_dis": "50 50",
          "kind": "other",
          "name": "Russian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "stealthily"
      ],
      "id": "en-украдкой-ru-adv-CSbZQBf9",
      "links": [
        [
          "stealthily",
          "stealthily"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ʊˈkratkəj]"
    },
    {
      "audio": "LL-Q7737 (rus)-Pacha Tchernof-украдкой.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/5/55/LL-Q7737_%28rus%29-Pacha_Tchernof-%D1%83%D0%BA%D1%80%D0%B0%D0%B4%D0%BA%D0%BE%D0%B9.wav/LL-Q7737_%28rus%29-Pacha_Tchernof-%D1%83%D0%BA%D1%80%D0%B0%D0%B4%D0%BA%D0%BE%D0%B9.wav.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/5/55/LL-Q7737_%28rus%29-Pacha_Tchernof-%D1%83%D0%BA%D1%80%D0%B0%D0%B4%D0%BA%D0%BE%D0%B9.wav/LL-Q7737_%28rus%29-Pacha_Tchernof-%D1%83%D0%BA%D1%80%D0%B0%D0%B4%D0%BA%D0%BE%D0%B9.wav.ogg",
      "text": "Audio"
    }
  ],
  "synonyms": [
    {
      "_dis1": "0 0",
      "roman": "skrýtno",
      "word": "скры́тно"
    },
    {
      "_dis1": "0 0",
      "roman": "ispodtišká",
      "word": "исподтишка́"
    },
    {
      "_dis1": "0 0",
      "roman": "vtixomolku",
      "word": "втихомолку"
    },
    {
      "_dis1": "0 0",
      "roman": "tajkóm",
      "word": "тайко́м"
    },
    {
      "_dis1": "0 0",
      "roman": "tájno",
      "word": "та́йно"
    }
  ],
  "word": "украдкой"
}

{
  "categories": [
    "Russian 3-syllable words",
    "Russian adverbs",
    "Russian entries with incorrect language header",
    "Russian lemmas",
    "Russian terms with IPA pronunciation",
    "Russian terms with audio links"
  ],
  "forms": [
    {
      "form": "укра́дкой",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "ukrádkoj",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "укра́дкой"
      },
      "expansion": "укра́дкой • (ukrádkoj)",
      "name": "ru-adv"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "adv",
  "senses": [
    {
      "glosses": [
        "furtively"
      ],
      "links": [
        [
          "furtively",
          "furtively"
        ]
      ]
    },
    {
      "glosses": [
        "stealthily"
      ],
      "links": [
        [
          "stealthily",
          "stealthily"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ʊˈkratkəj]"
    },
    {
      "audio": "LL-Q7737 (rus)-Pacha Tchernof-украдкой.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/5/55/LL-Q7737_%28rus%29-Pacha_Tchernof-%D1%83%D0%BA%D1%80%D0%B0%D0%B4%D0%BA%D0%BE%D0%B9.wav/LL-Q7737_%28rus%29-Pacha_Tchernof-%D1%83%D0%BA%D1%80%D0%B0%D0%B4%D0%BA%D0%BE%D0%B9.wav.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/5/55/LL-Q7737_%28rus%29-Pacha_Tchernof-%D1%83%D0%BA%D1%80%D0%B0%D0%B4%D0%BA%D0%BE%D0%B9.wav/LL-Q7737_%28rus%29-Pacha_Tchernof-%D1%83%D0%BA%D1%80%D0%B0%D0%B4%D0%BA%D0%BE%D0%B9.wav.ogg",
      "text": "Audio"
    }
  ],
  "synonyms": [
    {
      "roman": "skrýtno",
      "word": "скры́тно"
    },
    {
      "roman": "ispodtišká",
      "word": "исподтишка́"
    },
    {
      "roman": "vtixomolku",
      "word": "втихомолку"
    },
    {
      "roman": "tajkóm",
      "word": "тайко́м"
    },
    {
      "roman": "tájno",
      "word": "та́йно"
    }
  ],
  "word": "украдкой"
}