"obu-" meaning in Polish

{
  "etymology_templates": [
    {
      "args": {
        "1": "pl",
        "2": "af",
        "3": "pl>oba>both",
        "4": "pl>-u->interfix",
        "id": "ambi-",
        "tree": "1"
      },
      "expansion": "Etymology tree\nProto-Indo-European *bʰóh₁der.\nProto-Slavic *oba\nOld Polish oba\nPolish oba\nPolish -u-\nPolish obu-",
      "name": "etymon"
    },
    {
      "args": {
        "1": "pl",
        "2": "oba",
        "3": "-u-"
      },
      "expansion": "oba + -u-",
      "name": "af"
    }
  ],
  "etymology_text": "Etymology tree\nProto-Indo-European *bʰóh₁der.\nProto-Slavic *oba\nOld Polish oba\nPolish oba\nPolish -u-\nPolish obu-\nFrom oba + -u-.",
  "head_templates": [
    {
      "args": {
        "1": "pl",
        "2": "prefix"
      },
      "expansion": "obu-",
      "name": "head"
    }
  ],
  "hyphenation": [
    "[please"
  ],
  "lang": "Polish",
  "lang_code": "pl",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages using catfix",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 5 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Polish entries with Template:pl-pr without syllabification",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Polish entries with etymology trees",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Polish entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Polish terms interfixed with -u-",
          "parents": [],
          "source": "w"
        },
        {
          "_dis": "5 5 58 5 5 5 5 5 5",
          "kind": "other",
          "name": "Pages with 5 entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "5 5 63 5 5 5 5 5 5",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "obu- + strona → obustronny",
          "type": "example"
        }
      ],
      "glosses": [
        "ambi-, amphi-, both"
      ],
      "id": "en-obu--pl-prefix-q~-FT3Sa",
      "links": [
        [
          "ambi-",
          "ambi-#English"
        ],
        [
          "amphi-",
          "amphi-#English"
        ],
        [
          "both",
          "both#English"
        ]
      ],
      "synonyms": [
        {
          "word": "ambi-"
        },
        {
          "word": "amfi-"
        }
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ɔ.bu/"
    },
    {
      "rhymes": "-ɔbu"
    }
  ],
  "word": "obu-"
}

{
  "categories": [
    "Pages with 5 entries",
    "Pages with entries"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "pl",
        "2": "af",
        "3": "pl>oba>both",
        "4": "pl>-u->interfix",
        "id": "ambi-",
        "tree": "1"
      },
      "expansion": "Etymology tree\nProto-Indo-European *bʰóh₁der.\nProto-Slavic *oba\nOld Polish oba\nPolish oba\nPolish -u-\nPolish obu-",
      "name": "etymon"
    },
    {
      "args": {
        "1": "pl",
        "2": "oba",
        "3": "-u-"
      },
      "expansion": "oba + -u-",
      "name": "af"
    }
  ],
  "etymology_text": "Etymology tree\nProto-Indo-European *bʰóh₁der.\nProto-Slavic *oba\nOld Polish oba\nPolish oba\nPolish -u-\nPolish obu-\nFrom oba + -u-.",
  "head_templates": [
    {
      "args": {
        "1": "pl",
        "2": "prefix"
      },
      "expansion": "obu-",
      "name": "head"
    }
  ],
  "hyphenation": [
    "[please"
  ],
  "lang": "Polish",
  "lang_code": "pl",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        "Pages using catfix",
        "Pages with 5 entries",
        "Pages with entries",
        "Polish 2-syllable words",
        "Polish entries with Template:pl-pr without syllabification",
        "Polish entries with etymology trees",
        "Polish entries with incorrect language header",
        "Polish lemmas",
        "Polish prefixes",
        "Polish terms derived from Old Polish",
        "Polish terms derived from Proto-Indo-European",
        "Polish terms derived from Proto-Slavic",
        "Polish terms interfixed with -u-",
        "Polish terms with IPA pronunciation",
        "Rhymes:Polish/ɔbu",
        "Rhymes:Polish/ɔbu/2 syllables"
      ],
      "examples": [
        {
          "text": "obu- + strona → obustronny",
          "type": "example"
        }
      ],
      "glosses": [
        "ambi-, amphi-, both"
      ],
      "links": [
        [
          "ambi-",
          "ambi-#English"
        ],
        [
          "amphi-",
          "amphi-#English"
        ],
        [
          "both",
          "both#English"
        ]
      ],
      "synonyms": [
        {
          "word": "ambi-"
        },
        {
          "word": "amfi-"
        }
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ɔ.bu/"
    },
    {
      "rhymes": "-ɔbu"
    }
  ],
  "word": "obu-"
}