"биела" meaning in Bulgarian

{
  "forms": [
    {
      "form": "би́ела",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "bíela",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "би́ела"
      },
      "expansion": "би́ела • (bíela)",
      "name": "bg-part form"
    }
  ],
  "lang": "Bulgarian",
  "lang_code": "bg",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Bulgarian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "bíja",
          "word": "би́я"
        }
      ],
      "glosses": [
        "feminine singular past active imperfect participle of би́я (bíja)"
      ],
      "id": "en-биела-bg-verb-kPrvW9JV",
      "links": [
        [
          "би́я",
          "бия#Bulgarian"
        ]
      ],
      "tags": [
        "active",
        "feminine",
        "form-of",
        "imperfect",
        "participle",
        "past",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈbiɛɫɐ]"
    }
  ],
  "word": "биела"
}

{
  "forms": [
    {
      "form": "би́ела",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "bíela",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "би́ела"
      },
      "expansion": "би́ела • (bíela)",
      "name": "bg-part form"
    }
  ],
  "lang": "Bulgarian",
  "lang_code": "bg",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "Bulgarian entries with incorrect language header",
        "Bulgarian non-lemma forms",
        "Bulgarian participle forms",
        "Bulgarian terms with IPA pronunciation",
        "Bulgarian verb forms"
      ],
      "form_of": [
        {
          "extra": "bíja",
          "word": "би́я"
        }
      ],
      "glosses": [
        "feminine singular past active imperfect participle of би́я (bíja)"
      ],
      "links": [
        [
          "би́я",
          "бия#Bulgarian"
        ]
      ],
      "tags": [
        "active",
        "feminine",
        "form-of",
        "imperfect",
        "participle",
        "past",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈbiɛɫɐ]"
    }
  ],
  "word": "биела"
}