"увольняли" meaning in Russian

{
  "forms": [
    {
      "form": "увольня́ли",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "uvolʹnjáli",
      "tags": [
        "romanization"
      ]
    }
  ],
  "heads": [
    {
      "1": "ru",
      "2": "verb form",
      "head": "увольня́ли",
      "template_name": "head"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "verb",
  "senses": [
    {
      "form_of": [
        {
          "extra": "uvolʹnjátʹ",
          "word": "увольня́ть"
        }
      ],
      "glosses": [
        "plural past indicative imperfective of увольня́ть (uvolʹnjátʹ)"
      ],
      "id": "увольняли-verb",
      "nontopical_categories": [
        "Russian 4-syllable words",
        "Russian non-lemma forms",
        "Russian terms with IPA pronunciation",
        "Russian verb forms"
      ],
      "tags": [
        "form-of",
        "imperfective",
        "indicative",
        "past",
        "plural"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ʊvɐlʲˈnʲælʲɪ]"
    }
  ],
  "word": "увольняли"
}