"o-" meaning in Old Polish

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "pl",
            "2": "o-"
          },
          "expansion": "Polish: o-",
          "name": "desc"
        }
      ],
      "text": "Polish: o-"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "zlw-opl",
        "2": "sla-pro",
        "3": "*o(b)"
      },
      "expansion": "Proto-Slavic *o(b)",
      "name": "inh"
    },
    {
      "args": {
        "1": "zlw-opl",
        "2": "ine-pro",
        "3": "*h₃ebʰi"
      },
      "expansion": "Proto-Indo-European *h₃ebʰi",
      "name": "der"
    }
  ],
  "etymology_text": "Proto-Slavic *o(b), from Proto-Indo-European *h₃ebʰi.",
  "head_templates": [
    {
      "args": {
        "1": "zlw-opl",
        "2": "prefix"
      },
      "expansion": "o-",
      "name": "head"
    }
  ],
  "lang": "Old Polish",
  "lang_code": "zlw-opl",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        {
          "_dis": "45 0 55",
          "kind": "other",
          "name": "Old Polish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "o- + pozdny → opóździć",
          "type": "example"
        }
      ],
      "glosses": [
        "appears in front of some verbs meaning: to make something behave in a certain way, en-, be-, make"
      ],
      "id": "en-o--zlw-opl-prefix-15yfyzgd",
      "links": [
        [
          "en-",
          "en-#English"
        ],
        [
          "be-",
          "be-#English"
        ],
        [
          "make",
          "make#English"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "examples": [
        {
          "text": "o- + kropić → okropić",
          "type": "example"
        }
      ],
      "glosses": [
        "around"
      ],
      "id": "en-o--zlw-opl-prefix-pKAMhA~D",
      "links": [
        [
          "around",
          "around"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "categories": [
        {
          "_dis": "45 0 55",
          "kind": "other",
          "name": "Old Polish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "o- + soczyć → osoczyć",
          "type": "example"
        }
      ],
      "glosses": [
        "prefix indicating a perfective verb"
      ],
      "id": "en-o--zlw-opl-prefix-UNVWv~gs",
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ɔ/",
      "note": "10ᵗʰ–15ᵗʰ CE"
    },
    {
      "ipa": "/ɔ/",
      "note": "15ᵗʰ CE"
    }
  ],
  "word": "o-"
}

{
  "categories": [
    "Old Polish entries with incorrect language header",
    "Old Polish lemmas",
    "Old Polish prefixes",
    "Old Polish terms derived from Proto-Indo-European",
    "Old Polish terms derived from Proto-Slavic",
    "Old Polish terms inherited from Proto-Slavic",
    "Old Polish terms with IPA pronunciation",
    "Pages with raw sortkeys"
  ],
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "pl",
            "2": "o-"
          },
          "expansion": "Polish: o-",
          "name": "desc"
        }
      ],
      "text": "Polish: o-"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "zlw-opl",
        "2": "sla-pro",
        "3": "*o(b)"
      },
      "expansion": "Proto-Slavic *o(b)",
      "name": "inh"
    },
    {
      "args": {
        "1": "zlw-opl",
        "2": "ine-pro",
        "3": "*h₃ebʰi"
      },
      "expansion": "Proto-Indo-European *h₃ebʰi",
      "name": "der"
    }
  ],
  "etymology_text": "Proto-Slavic *o(b), from Proto-Indo-European *h₃ebʰi.",
  "head_templates": [
    {
      "args": {
        "1": "zlw-opl",
        "2": "prefix"
      },
      "expansion": "o-",
      "name": "head"
    }
  ],
  "lang": "Old Polish",
  "lang_code": "zlw-opl",
  "pos": "prefix",
  "senses": [
    {
      "examples": [
        {
          "text": "o- + pozdny → opóździć",
          "type": "example"
        }
      ],
      "glosses": [
        "appears in front of some verbs meaning: to make something behave in a certain way, en-, be-, make"
      ],
      "links": [
        [
          "en-",
          "en-#English"
        ],
        [
          "be-",
          "be-#English"
        ],
        [
          "make",
          "make#English"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "examples": [
        {
          "text": "o- + kropić → okropić",
          "type": "example"
        }
      ],
      "glosses": [
        "around"
      ],
      "links": [
        [
          "around",
          "around"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "examples": [
        {
          "text": "o- + soczyć → osoczyć",
          "type": "example"
        }
      ],
      "glosses": [
        "prefix indicating a perfective verb"
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ɔ/",
      "note": "10ᵗʰ–15ᵗʰ CE"
    },
    {
      "ipa": "/ɔ/",
      "note": "15ᵗʰ CE"
    }
  ],
  "word": "o-"
}