"оу-" meaning in Old Church Slavonic

{
  "etymology_templates": [
    {
      "args": {
        "1": "cu",
        "2": "sla-pro",
        "3": "*u-"
      },
      "expansion": "Proto-Slavic *u-",
      "name": "inh"
    }
  ],
  "etymology_text": "From Proto-Slavic *u-.",
  "forms": [
    {
      "form": "u-",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "cu",
        "2": "prefix"
      },
      "expansion": "оу- • (u-)",
      "name": "head"
    }
  ],
  "lang": "Old Church Slavonic",
  "lang_code": "cu",
  "pos": "prefix",
  "related": [
    {
      "_dis1": "0 0 0",
      "roman": "u",
      "word": "оу"
    }
  ],
  "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": "50 9 41",
          "kind": "other",
          "name": "Pages using catfix",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "61 15 25",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "79 5 16",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "оу- (u-) + тещи (tešti, “to run”) → оутещи (utešti, “to run away, escape”)",
          "type": "example"
        }
      ],
      "glosses": [
        "from"
      ],
      "id": "en-оу--cu-prefix-dYV6RYmZ",
      "links": [
        [
          "away",
          "away"
        ]
      ],
      "qualifier": "away",
      "raw_glosses": [
        "(away) from"
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "examples": [
        {
          "text": "оу- (u-) + бости (bosti) → оубости (ubosti)",
          "type": "example"
        }
      ],
      "glosses": [
        "perfective prefix"
      ],
      "id": "en-оу--cu-prefix-HuZn6zCW",
      "tags": [
        "morpheme",
        "perfective",
        "prefix"
      ]
    },
    {
      "categories": [
        {
          "_dis": "50 9 41",
          "kind": "other",
          "name": "Pages using catfix",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "оу- (u-) + говорити impf (govoriti, “to say”) → оуговорити pf (ugovoriti, “to persuade”)"
        },
        {
          "text": "оу- (u-) + знати impf (znati, “to know”) → оузнати pf (uznati, “to get to know”)"
        }
      ],
      "glosses": [
        "with a more concrete purpose"
      ],
      "id": "en-оу--cu-prefix-eny5R62z",
      "links": [
        [
          "concrete",
          "concrete"
        ],
        [
          "purpose",
          "purpose"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "оу-"
}

{
  "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",
    "Pages using catfix",
    "Pages with 1 entry",
    "Pages with entries"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "cu",
        "2": "sla-pro",
        "3": "*u-"
      },
      "expansion": "Proto-Slavic *u-",
      "name": "inh"
    }
  ],
  "etymology_text": "From Proto-Slavic *u-.",
  "forms": [
    {
      "form": "u-",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "cu",
        "2": "prefix"
      },
      "expansion": "оу- • (u-)",
      "name": "head"
    }
  ],
  "lang": "Old Church Slavonic",
  "lang_code": "cu",
  "pos": "prefix",
  "related": [
    {
      "roman": "u",
      "word": "оу"
    }
  ],
  "senses": [
    {
      "examples": [
        {
          "text": "оу- (u-) + тещи (tešti, “to run”) → оутещи (utešti, “to run away, escape”)",
          "type": "example"
        }
      ],
      "glosses": [
        "from"
      ],
      "links": [
        [
          "away",
          "away"
        ]
      ],
      "qualifier": "away",
      "raw_glosses": [
        "(away) from"
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "examples": [
        {
          "text": "оу- (u-) + бости (bosti) → оубости (ubosti)",
          "type": "example"
        }
      ],
      "glosses": [
        "perfective prefix"
      ],
      "tags": [
        "morpheme",
        "perfective",
        "prefix"
      ]
    },
    {
      "examples": [
        {
          "text": "оу- (u-) + говорити impf (govoriti, “to say”) → оуговорити pf (ugovoriti, “to persuade”)"
        },
        {
          "text": "оу- (u-) + знати impf (znati, “to know”) → оузнати pf (uznati, “to get to know”)"
        }
      ],
      "glosses": [
        "with a more concrete purpose"
      ],
      "links": [
        [
          "concrete",
          "concrete"
        ],
        [
          "purpose",
          "purpose"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "оу-"
}