"о-" meaning in Old Church Slavonic

{
  "etymology_templates": [
    {
      "args": {
        "1": "cu",
        "2": "sla-pro",
        "3": "*o(b)"
      },
      "expansion": "Proto-Slavic *o(b)",
      "name": "inh"
    }
  ],
  "etymology_text": "From Proto-Slavic *o(b).",
  "forms": [
    {
      "form": "o-",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "cu",
        "2": "prefix",
        "cat2": "verbal prefixes"
      },
      "expansion": "о- • (o-)",
      "name": "head"
    }
  ],
  "lang": "Old Church Slavonic",
  "lang_code": "cu",
  "pos": "prefix",
  "related": [
    {
      "_dis1": "0 0 0",
      "roman": "o",
      "word": "о"
    },
    {
      "_dis1": "0 0 0",
      "roman": "ob",
      "word": "об"
    }
  ],
  "senses": [
    {
      "categories": [
        {
          "_dis": "52 23 25",
          "kind": "other",
          "name": "Old Church Slavonic entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "15 7 7 13 13 15 7 7 8 8",
          "kind": "other",
          "name": "Pages using catfix",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "15 7 7 13 13 15 7 7 7 7",
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "15 7 7 14 14 15 7 7 7 7",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "prefix added to verbs of motion: about, around"
      ],
      "id": "en-о--cu-prefix-0XzgsMN1",
      "links": [
        [
          "about",
          "about"
        ],
        [
          "around",
          "around"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "glosses": [
        "prefix added to nouns: close by, around"
      ],
      "id": "en-о--cu-prefix-jIpN5a3t",
      "links": [
        [
          "close",
          "close"
        ],
        [
          "by",
          "by"
        ],
        [
          "around",
          "around"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "glosses": [
        "prefix added to verbs: completely, to the full extent"
      ],
      "id": "en-о--cu-prefix-f2H0eNKl",
      "links": [
        [
          "completely",
          "completely"
        ],
        [
          "full",
          "full"
        ],
        [
          "extent",
          "extent"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "synonyms": [
    {
      "_dis1": "0 0 0",
      "roman": "ob-",
      "word": "об-"
    }
  ],
  "word": "о-"
}

{
  "categories": [
    "Old Church Slavonic entries with incorrect language header",
    "Old Church Slavonic lemmas",
    "Old Church Slavonic prefixes",
    "Old Church Slavonic terms derived from Proto-Slavic",
    "Old Church Slavonic terms inherited from Proto-Slavic",
    "Old Church Slavonic verbal prefixes",
    "Pages using catfix",
    "Pages with 2 entries",
    "Pages with entries"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "cu",
        "2": "sla-pro",
        "3": "*o(b)"
      },
      "expansion": "Proto-Slavic *o(b)",
      "name": "inh"
    }
  ],
  "etymology_text": "From Proto-Slavic *o(b).",
  "forms": [
    {
      "form": "o-",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "cu",
        "2": "prefix",
        "cat2": "verbal prefixes"
      },
      "expansion": "о- • (o-)",
      "name": "head"
    }
  ],
  "lang": "Old Church Slavonic",
  "lang_code": "cu",
  "pos": "prefix",
  "related": [
    {
      "roman": "o",
      "word": "о"
    },
    {
      "roman": "ob",
      "word": "об"
    }
  ],
  "senses": [
    {
      "glosses": [
        "prefix added to verbs of motion: about, around"
      ],
      "links": [
        [
          "about",
          "about"
        ],
        [
          "around",
          "around"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "glosses": [
        "prefix added to nouns: close by, around"
      ],
      "links": [
        [
          "close",
          "close"
        ],
        [
          "by",
          "by"
        ],
        [
          "around",
          "around"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "glosses": [
        "prefix added to verbs: completely, to the full extent"
      ],
      "links": [
        [
          "completely",
          "completely"
        ],
        [
          "full",
          "full"
        ],
        [
          "extent",
          "extent"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "synonyms": [
    {
      "roman": "ob-",
      "word": "об-"
    }
  ],
  "word": "о-"
}