"-ko" meaning in Serbo-Croatian

{
  "forms": [
    {
      "form": "-ко",
      "tags": [
        "Cyrillic"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "-ko (Cyrillic spelling -ко)",
      "name": "sh-suffix"
    }
  ],
  "lang": "Serbo-Croatian",
  "lang_code": "sh",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Serbo-Croatian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "dar + -ko → Darko",
          "type": "example"
        },
        {
          "text": "Jano + -ko → Janko",
          "type": "example"
        },
        {
          "text": "debeo + -ko → debeljko (“fatty (meant as an insult)”)",
          "type": "example"
        }
      ],
      "glosses": [
        "Suffix appended to words to create a masculine noun, most likely to make diminutive. Usually used to make names, or nicknames denoting a negative feature."
      ],
      "id": "en--ko-sh-suffix-3j5XHbku",
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-ko"
}

{
  "forms": [
    {
      "form": "-ко",
      "tags": [
        "Cyrillic"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "-ko (Cyrillic spelling -ко)",
      "name": "sh-suffix"
    }
  ],
  "lang": "Serbo-Croatian",
  "lang_code": "sh",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Serbo-Croatian diminutive suffixes",
        "Serbo-Croatian entries with incorrect language header",
        "Serbo-Croatian lemmas",
        "Serbo-Croatian suffixes"
      ],
      "examples": [
        {
          "text": "dar + -ko → Darko",
          "type": "example"
        },
        {
          "text": "Jano + -ko → Janko",
          "type": "example"
        },
        {
          "text": "debeo + -ko → debeljko (“fatty (meant as an insult)”)",
          "type": "example"
        }
      ],
      "glosses": [
        "Suffix appended to words to create a masculine noun, most likely to make diminutive. Usually used to make names, or nicknames denoting a negative feature."
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-ko"
}