"-u" meaning in Proto-Germanic

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "got",
            "2": "-𐌿"
          },
          "expansion": "Gothic: -𐌿 (-u)",
          "name": "desc"
        }
      ],
      "text": "Gothic: -𐌿 (-u)"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "gem-pro",
        "2": "ine-pro",
        "3": "*-wē"
      },
      "expansion": "Proto-Indo-European *-wē",
      "name": "der"
    },
    {
      "args": {
        "1": "la",
        "2": "-ve"
      },
      "expansion": "Latin -ve",
      "name": "cog"
    },
    {
      "args": {
        "1": "grc",
        "2": "ἤ"
      },
      "expansion": "Ancient Greek ἤ (ḗ)",
      "name": "cog"
    },
    {
      "args": {
        "1": "txb",
        "2": "wa"
      },
      "expansion": "Tocharian B wa",
      "name": "cog"
    },
    {
      "args": {
        "1": "sa",
        "2": "वा"
      },
      "expansion": "Sanskrit वा (vā)",
      "name": "cog"
    }
  ],
  "etymology_text": "Possibly from Pre-Germanic *-we, from Proto-Indo-European *-wē, which would make it cognate to Latin -ve, Ancient Greek ἤ (ḗ), Tocharian B wa and Sanskrit वा (vā).",
  "head_templates": [
    {
      "args": {
        "1": "gem-pro",
        "2": "East Germanic"
      },
      "expansion": "(East Germanic)",
      "name": "tlb"
    }
  ],
  "lang": "Proto-Germanic",
  "lang_code": "gem-pro",
  "original_title": "Reconstruction:Proto-Germanic/-u",
  "pos": "particle",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "East Proto-Germanic",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Proto-Germanic entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Proto-Germanic particles",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Added to the end of a word in a phrase (usually the first word) to make it a question."
      ],
      "id": "en--u-gem-pro-particle-fHskLLQv",
      "tags": [
        "East",
        "Germanic",
        "reconstruction"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/u/"
    }
  ],
  "word": "-u"
}

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "got",
            "2": "-𐌿"
          },
          "expansion": "Gothic: -𐌿 (-u)",
          "name": "desc"
        }
      ],
      "text": "Gothic: -𐌿 (-u)"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "gem-pro",
        "2": "ine-pro",
        "3": "*-wē"
      },
      "expansion": "Proto-Indo-European *-wē",
      "name": "der"
    },
    {
      "args": {
        "1": "la",
        "2": "-ve"
      },
      "expansion": "Latin -ve",
      "name": "cog"
    },
    {
      "args": {
        "1": "grc",
        "2": "ἤ"
      },
      "expansion": "Ancient Greek ἤ (ḗ)",
      "name": "cog"
    },
    {
      "args": {
        "1": "txb",
        "2": "wa"
      },
      "expansion": "Tocharian B wa",
      "name": "cog"
    },
    {
      "args": {
        "1": "sa",
        "2": "वा"
      },
      "expansion": "Sanskrit वा (vā)",
      "name": "cog"
    }
  ],
  "etymology_text": "Possibly from Pre-Germanic *-we, from Proto-Indo-European *-wē, which would make it cognate to Latin -ve, Ancient Greek ἤ (ḗ), Tocharian B wa and Sanskrit वा (vā).",
  "head_templates": [
    {
      "args": {
        "1": "gem-pro",
        "2": "East Germanic"
      },
      "expansion": "(East Germanic)",
      "name": "tlb"
    }
  ],
  "lang": "Proto-Germanic",
  "lang_code": "gem-pro",
  "original_title": "Reconstruction:Proto-Germanic/-u",
  "pos": "particle",
  "senses": [
    {
      "categories": [
        "East Proto-Germanic",
        "Pages with 1 entry",
        "Pages with entries",
        "Proto-Germanic entries with incorrect language header",
        "Proto-Germanic lemmas",
        "Proto-Germanic particles",
        "Proto-Germanic terms derived from Proto-Indo-European"
      ],
      "glosses": [
        "Added to the end of a word in a phrase (usually the first word) to make it a question."
      ],
      "tags": [
        "East",
        "Germanic",
        "reconstruction"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/u/"
    }
  ],
  "word": "-u"
}