"-zgъ" meaning in Proto-Slavic

{
  "etymology_templates": [
    {
      "args": {
        "1": "sla-pro",
        "2": "*-skъ"
      },
      "expansion": "Proto-Slavic *-skъ",
      "name": "cog"
    },
    {
      "args": {
        "1": "sla-pro",
        "2": "*mozgъ",
        "3": "",
        "4": "brain"
      },
      "expansion": "Proto-Slavic *mozgъ (“brain”)",
      "name": "noncog"
    },
    {
      "args": {
        "1": "sla-pro",
        "2": "*drozgъ",
        "3": "",
        "4": "thrush"
      },
      "expansion": "Proto-Slavic *drozgъ (“thrush”)",
      "name": "noncog"
    },
    {
      "args": {
        "1": "sla-pro",
        "2": "ine-pro",
        "3": "",
        "4": "*-sgʰos"
      },
      "expansion": "Proto-Indo-European *-sgʰos",
      "name": "der"
    }
  ],
  "etymology_text": "Most likely a voiced doublet of Proto-Slavic *-skъ, occurring in roots ending in a voiced consonant or in expressive roots - for emphasis.\nAlso appears as a root coda in words such as Proto-Slavic *mozgъ (“brain”), Proto-Slavic *drozgъ (“thrush”) from Proto-Indo-European *-sgʰos.",
  "lang": "Proto-Slavic",
  "lang_code": "sla-pro",
  "original_title": "Reconstruction:Proto-Slavic/-zgъ",
  "pos": "suffix",
  "senses": [
    {
      "alt_of": [
        {
          "word": "*-skъ"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Proto-Slavic entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Alternative form of *-skъ"
      ],
      "id": "en--zgъ-sla-pro-suffix-OkI6UfDZ",
      "links": [
        [
          "*-skъ",
          "Reconstruction:Proto-Slavic/-skъ"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "masculine",
        "morpheme",
        "reconstruction"
      ]
    }
  ],
  "word": "-zgъ"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "sla-pro",
        "2": "*-skъ"
      },
      "expansion": "Proto-Slavic *-skъ",
      "name": "cog"
    },
    {
      "args": {
        "1": "sla-pro",
        "2": "*mozgъ",
        "3": "",
        "4": "brain"
      },
      "expansion": "Proto-Slavic *mozgъ (“brain”)",
      "name": "noncog"
    },
    {
      "args": {
        "1": "sla-pro",
        "2": "*drozgъ",
        "3": "",
        "4": "thrush"
      },
      "expansion": "Proto-Slavic *drozgъ (“thrush”)",
      "name": "noncog"
    },
    {
      "args": {
        "1": "sla-pro",
        "2": "ine-pro",
        "3": "",
        "4": "*-sgʰos"
      },
      "expansion": "Proto-Indo-European *-sgʰos",
      "name": "der"
    }
  ],
  "etymology_text": "Most likely a voiced doublet of Proto-Slavic *-skъ, occurring in roots ending in a voiced consonant or in expressive roots - for emphasis.\nAlso appears as a root coda in words such as Proto-Slavic *mozgъ (“brain”), Proto-Slavic *drozgъ (“thrush”) from Proto-Indo-European *-sgʰos.",
  "lang": "Proto-Slavic",
  "lang_code": "sla-pro",
  "original_title": "Reconstruction:Proto-Slavic/-zgъ",
  "pos": "suffix",
  "senses": [
    {
      "alt_of": [
        {
          "word": "*-skъ"
        }
      ],
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Proto-Slavic entries with incorrect language header",
        "Proto-Slavic lemmas",
        "Proto-Slavic masculine suffixes",
        "Proto-Slavic noun-forming suffixes",
        "Proto-Slavic suffixes",
        "Proto-Slavic terms derived from Proto-Indo-European"
      ],
      "glosses": [
        "Alternative form of *-skъ"
      ],
      "links": [
        [
          "*-skъ",
          "Reconstruction:Proto-Slavic/-skъ"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "masculine",
        "morpheme",
        "reconstruction"
      ]
    }
  ],
  "word": "-zgъ"
}