"-at" meaning in Old Norse

{
  "etymology_templates": [
    {
      "args": {
        "1": "non",
        "2": "gem-pro",
        "3": "*aiwwihtiz"
      },
      "expansion": "Proto-Germanic *aiwwihtiz",
      "name": "der"
    },
    {
      "args": {
        "1": "ang",
        "2": "āwiht",
        "3": "",
        "4": "anything, something; at all"
      },
      "expansion": "Old English āwiht (“anything, something; at all”)",
      "name": "cog"
    },
    {
      "args": {
        "1": "fr",
        "2": "pas",
        "3": "",
        "4": "not"
      },
      "expansion": "French pas (“not”)",
      "name": "ncog"
    }
  ],
  "etymology_text": "Possibly from Proto-Germanic *aiwwihtiz, whence Old English āwiht (“anything, something; at all”). The prototype of ek veit-at 'I don't know' would then be Proto-Norse *ek ne wait aiwwihti 'I know not at all', after which *aiwwihti was reduced to -at and ne eventually dropped in a process identical to the origin of French pas (“not”).",
  "forms": [
    {
      "form": "-a",
      "tags": [
        "alternative"
      ]
    },
    {
      "form": "-t",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "non",
        "2": "suffix"
      },
      "expansion": "-at",
      "name": "head"
    }
  ],
  "lang": "Old Norse",
  "lang_code": "non",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Old Norse entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages using catfix",
          "parents": [],
          "source": "w"
        },
        {
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          "parents": [],
          "source": "w"
        },
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          "parents": [],
          "source": "w"
        }
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      "examples": [
        {
          "bold_english_offsets": [
            [
              9,
              12
            ]
          ],
          "bold_text_offsets": [
            [
              9,
              11
            ]
          ],
          "english": "he knows not",
          "text": "hann veitat",
          "type": "example"
        }
      ],
      "glosses": [
        "negative verbal suffix; does not"
      ],
      "id": "en--at-non-suffix-gpEUCwBU",
      "synonyms": [
        {
          "word": "eigi"
        },
        {
          "word": "né"
        }
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-at"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "non",
        "2": "gem-pro",
        "3": "*aiwwihtiz"
      },
      "expansion": "Proto-Germanic *aiwwihtiz",
      "name": "der"
    },
    {
      "args": {
        "1": "ang",
        "2": "āwiht",
        "3": "",
        "4": "anything, something; at all"
      },
      "expansion": "Old English āwiht (“anything, something; at all”)",
      "name": "cog"
    },
    {
      "args": {
        "1": "fr",
        "2": "pas",
        "3": "",
        "4": "not"
      },
      "expansion": "French pas (“not”)",
      "name": "ncog"
    }
  ],
  "etymology_text": "Possibly from Proto-Germanic *aiwwihtiz, whence Old English āwiht (“anything, something; at all”). The prototype of ek veit-at 'I don't know' would then be Proto-Norse *ek ne wait aiwwihti 'I know not at all', after which *aiwwihti was reduced to -at and ne eventually dropped in a process identical to the origin of French pas (“not”).",
  "forms": [
    {
      "form": "-a",
      "tags": [
        "alternative"
      ]
    },
    {
      "form": "-t",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "non",
        "2": "suffix"
      },
      "expansion": "-at",
      "name": "head"
    }
  ],
  "lang": "Old Norse",
  "lang_code": "non",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Old Norse entries with incorrect language header",
        "Old Norse lemmas",
        "Old Norse suffixes",
        "Old Norse terms derived from Proto-Germanic",
        "Old Norse terms with usage examples",
        "Pages using catfix",
        "Pages with 20 entries",
        "Pages with entries"
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            [
              9,
              12
            ]
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            [
              9,
              11
            ]
          ],
          "english": "he knows not",
          "text": "hann veitat",
          "type": "example"
        }
      ],
      "glosses": [
        "negative verbal suffix; does not"
      ],
      "synonyms": [
        {
          "word": "eigi"
        },
        {
          "word": "né"
        }
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-at"
}