"с-" meaning in Serbo-Croatian

{
  "forms": [
    {
      "form": "s-",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "са-",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "с- (Latin spelling s-)",
      "name": "sh-prefix"
    }
  ],
  "lang": "Serbo-Croatian",
  "lang_code": "sh",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages using catfix",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 4 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Serbo-Croatian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "_dis": "0 0 6 6 20 8 41 3 16",
          "kind": "other",
          "name": "Pages using catfix",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "0 0 7 7 25 9 31 3 18",
          "kind": "other",
          "name": "Pages with 4 entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "с- + пу̀стити → спу̀стити",
          "type": "example"
        },
        {
          "text": "с- + зна̏ти → са̀знати",
          "type": "example"
        },
        {
          "text": "с- + ло̀мити → сло̀мити",
          "type": "example"
        },
        {
          "text": "с- + гле̏дати → са̀гледати",
          "type": "example"
        },
        {
          "text": "с- + ку̏пити → ску̏пити",
          "type": "example"
        },
        {
          "text": "с- + кло̀нити → скло̀нити",
          "type": "example"
        },
        {
          "text": "с- + на́ћи → сна̑ћи",
          "type": "example"
        }
      ],
      "glosses": [
        "Prepended to verbs, usually forming a perfective from an imperfective verb."
      ],
      "id": "en-с--sh-prefix-AJKJlfoB",
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "с-"
}

{
  "categories": [
    "Pages using catfix",
    "Pages with 4 entries",
    "Pages with entries"
  ],
  "forms": [
    {
      "form": "s-",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "са-",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "с- (Latin spelling s-)",
      "name": "sh-prefix"
    }
  ],
  "lang": "Serbo-Croatian",
  "lang_code": "sh",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        "Pages using catfix",
        "Pages with 4 entries",
        "Pages with entries",
        "Serbo-Croatian entries with incorrect language header",
        "Serbo-Croatian lemmas",
        "Serbo-Croatian prefixes"
      ],
      "examples": [
        {
          "text": "с- + пу̀стити → спу̀стити",
          "type": "example"
        },
        {
          "text": "с- + зна̏ти → са̀знати",
          "type": "example"
        },
        {
          "text": "с- + ло̀мити → сло̀мити",
          "type": "example"
        },
        {
          "text": "с- + гле̏дати → са̀гледати",
          "type": "example"
        },
        {
          "text": "с- + ку̏пити → ску̏пити",
          "type": "example"
        },
        {
          "text": "с- + кло̀нити → скло̀нити",
          "type": "example"
        },
        {
          "text": "с- + на́ћи → сна̑ћи",
          "type": "example"
        }
      ],
      "glosses": [
        "Prepended to verbs, usually forming a perfective from an imperfective verb."
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "с-"
}