"hwiu" meaning in Old Saxon

{
  "etymology_templates": [
    {
      "args": {
        "1": "osx",
        "2": "gem-pro",
        "3": "*hwī",
        "4": "",
        "5": "with what"
      },
      "expansion": "Proto-Germanic *hwī (“with what”)",
      "name": "der"
    }
  ],
  "etymology_text": "From Proto-Germanic *hwī (“with what”), to which the more common instrumental ending *-ō had been added.",
  "head_templates": [
    {
      "args": {
        "1": "osx",
        "2": "adverb",
        "head": "hwiu"
      },
      "expansion": "hwiu",
      "name": "head"
    }
  ],
  "lang": "Old Saxon",
  "lang_code": "osx",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Old Saxon entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "why"
      ],
      "id": "en-hwiu-osx-adv-K-I8WF8V",
      "links": [
        [
          "why",
          "why"
        ]
      ],
      "related": [
        {
          "word": "hwi"
        },
        {
          "word": "hu"
        },
        {
          "word": "hwo"
        },
        {
          "word": "hwanne"
        }
      ]
    }
  ],
  "word": "hwiu"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "osx",
        "2": "gem-pro",
        "3": "*hwī",
        "4": "",
        "5": "with what"
      },
      "expansion": "Proto-Germanic *hwī (“with what”)",
      "name": "der"
    }
  ],
  "etymology_text": "From Proto-Germanic *hwī (“with what”), to which the more common instrumental ending *-ō had been added.",
  "head_templates": [
    {
      "args": {
        "1": "osx",
        "2": "adverb",
        "head": "hwiu"
      },
      "expansion": "hwiu",
      "name": "head"
    }
  ],
  "lang": "Old Saxon",
  "lang_code": "osx",
  "pos": "adv",
  "related": [
    {
      "word": "hwi"
    },
    {
      "word": "hu"
    },
    {
      "word": "hwo"
    },
    {
      "word": "hwanne"
    }
  ],
  "senses": [
    {
      "categories": [
        "Old Saxon adverbs",
        "Old Saxon entries with incorrect language header",
        "Old Saxon lemmas",
        "Old Saxon terms derived from Proto-Germanic",
        "Old Saxon terms with redundant head parameter",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "why"
      ],
      "links": [
        [
          "why",
          "why"
        ]
      ]
    }
  ],
  "word": "hwiu"
}