"когда-то" meaning in Russian

{
  "forms": [
    {
      "form": "когда́ -то",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "kogdá-to",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "когда́-то"
      },
      "expansion": "когда́-то • (kogdá-to)",
      "name": "ru-adv"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Russian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "once (upon a time), formerly; constructions with used to"
      ],
      "id": "en-когда-то-ru-adv-NC96LcDO",
      "links": [
        [
          "once",
          "once"
        ],
        [
          "formerly",
          "formerly"
        ],
        [
          "used to",
          "used to"
        ]
      ],
      "related": [
        {
          "roman": "kogdá",
          "word": "когда́"
        },
        {
          "roman": "kogdá-libo",
          "word": "когда́-либо"
        },
        {
          "roman": "kogdá-nibudʹ",
          "word": "когда́-нибудь"
        },
        {
          "roman": "koje-kogdá",
          "word": "кое-когда́"
        },
        {
          "roman": "gdé-to",
          "word": "где́-то"
        },
        {
          "roman": "kák-to",
          "word": "ка́к-то"
        },
        {
          "roman": "kakój-to",
          "word": "како́й-то"
        },
        {
          "roman": "któ-to",
          "word": "кто́-то"
        },
        {
          "roman": "kudá-to",
          "word": "куда́-то"
        },
        {
          "roman": "otkúda-to",
          "word": "отку́да-то"
        },
        {
          "roman": "čéj-to",
          "word": "че́й-то"
        },
        {
          "roman": "štó-to",
          "word": "что́-то"
        }
      ],
      "synonyms": [
        {
          "word": "когда́-нибудь"
        },
        {
          "word": "не́когда"
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[kɐɡˈda‿tə]"
    },
    {
      "audio": "Ru-когда-то.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/9/90/Ru-%D0%BA%D0%BE%D0%B3%D0%B4%D0%B0-%D1%82%D0%BE.ogg/Ru-%D0%BA%D0%BE%D0%B3%D0%B4%D0%B0-%D1%82%D0%BE.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/9/90/Ru-%D0%BA%D0%BE%D0%B3%D0%B4%D0%B0-%D1%82%D0%BE.ogg",
      "text": "Audio"
    }
  ],
  "word": "когда-то"
}

{
  "forms": [
    {
      "form": "когда́ -то",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "kogdá-to",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "когда́-то"
      },
      "expansion": "когда́-то • (kogdá-to)",
      "name": "ru-adv"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "adv",
  "related": [
    {
      "roman": "kogdá",
      "word": "когда́"
    },
    {
      "roman": "kogdá-libo",
      "word": "когда́-либо"
    },
    {
      "roman": "kogdá-nibudʹ",
      "word": "когда́-нибудь"
    },
    {
      "roman": "koje-kogdá",
      "word": "кое-когда́"
    },
    {
      "roman": "gdé-to",
      "word": "где́-то"
    },
    {
      "roman": "kák-to",
      "word": "ка́к-то"
    },
    {
      "roman": "kakój-to",
      "word": "како́й-то"
    },
    {
      "roman": "któ-to",
      "word": "кто́-то"
    },
    {
      "roman": "kudá-to",
      "word": "куда́-то"
    },
    {
      "roman": "otkúda-to",
      "word": "отку́да-то"
    },
    {
      "roman": "čéj-to",
      "word": "че́й-то"
    },
    {
      "roman": "štó-to",
      "word": "что́-то"
    }
  ],
  "senses": [
    {
      "categories": [
        "Russian adverbs",
        "Russian entries with incorrect language header",
        "Russian lemmas",
        "Russian multiword terms",
        "Russian terms with IPA pronunciation",
        "Russian terms with audio links"
      ],
      "glosses": [
        "once (upon a time), formerly; constructions with used to"
      ],
      "links": [
        [
          "once",
          "once"
        ],
        [
          "formerly",
          "formerly"
        ],
        [
          "used to",
          "used to"
        ]
      ],
      "synonyms": [
        {
          "word": "когда́-нибудь"
        },
        {
          "word": "не́когда"
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[kɐɡˈda‿tə]"
    },
    {
      "audio": "Ru-когда-то.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/9/90/Ru-%D0%BA%D0%BE%D0%B3%D0%B4%D0%B0-%D1%82%D0%BE.ogg/Ru-%D0%BA%D0%BE%D0%B3%D0%B4%D0%B0-%D1%82%D0%BE.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/9/90/Ru-%D0%BA%D0%BE%D0%B3%D0%B4%D0%B0-%D1%82%D0%BE.ogg",
      "text": "Audio"
    }
  ],
  "word": "когда-то"
}