"-бын" meaning in Kazakh

{
  "forms": [
    {
      "form": "-byn",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "kk",
        "2": "suffix form"
      },
      "expansion": "-бын • (-byn)",
      "name": "head"
    }
  ],
  "lang": "Kazakh",
  "lang_code": "kk",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Kazakh entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "(-mın) in hard words and after З, Ж",
          "word": "-мін"
        }
      ],
      "glosses": [
        "Form of -мін (-mın) in hard words and after З, Ж."
      ],
      "id": "en--бын-kk-suffix-7fAaqCk6",
      "links": [
        [
          "-мін",
          "-мін#Kazakh"
        ]
      ],
      "tags": [
        "form-of",
        "morpheme"
      ]
    }
  ],
  "word": "-бын"
}

{
  "forms": [
    {
      "form": "-byn",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "kk",
        "2": "suffix form"
      },
      "expansion": "-бын • (-byn)",
      "name": "head"
    }
  ],
  "lang": "Kazakh",
  "lang_code": "kk",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Kazakh entries with incorrect language header",
        "Kazakh non-lemma forms",
        "Kazakh suffix forms",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "form_of": [
        {
          "extra": "(-mın) in hard words and after З, Ж",
          "word": "-мін"
        }
      ],
      "glosses": [
        "Form of -мін (-mın) in hard words and after З, Ж."
      ],
      "links": [
        [
          "-мін",
          "-мін#Kazakh"
        ]
      ],
      "tags": [
        "form-of",
        "morpheme"
      ]
    }
  ],
  "word": "-бын"
}