"i-" meaning in Tocharian B

{
  "etymology_templates": [
    {
      "args": {
        "1": "txb",
        "2": "ine-pro",
        "3": "*h₁ey-"
      },
      "expansion": "",
      "name": "root"
    },
    {
      "args": {
        "1": "txb",
        "2": "ine-toc-pro",
        "3": "*jä-"
      },
      "expansion": "Proto-Tocharian *jä-",
      "name": "inh"
    },
    {
      "args": {
        "1": "xto",
        "2": "i-"
      },
      "expansion": "Tocharian A i-",
      "name": "cog"
    },
    {
      "args": {
        "1": "txb",
        "2": "ine-pro",
        "3": "*h₁ey-",
        "4": "",
        "5": "to move"
      },
      "expansion": "Proto-Indo-European *h₁ey- (“to move”)",
      "name": "inh"
    },
    {
      "args": {
        "1": "la",
        "2": "eō"
      },
      "expansion": "Latin eō",
      "name": "cog"
    },
    {
      "args": {
        "1": "pl",
        "2": "iść"
      },
      "expansion": "Polish iść",
      "name": "cog"
    },
    {
      "args": {
        "1": "txb",
        "2": "mäs-"
      },
      "expansion": "mäs-",
      "name": "m"
    },
    {
      "args": {
        "1": "txb",
        "2": "ine-pro",
        "3": "*mew-",
        "4": "",
        "5": "to move"
      },
      "expansion": "Proto-Indo-European *mew- (“to move”)",
      "name": "der"
    },
    {
      "args": {
        "1": "suppletive"
      },
      "expansion": "suppletive",
      "name": "glossary"
    }
  ],
  "etymology_text": "From Proto-Tocharian *jä-, whence also Tocharian A i-, from Proto-Indo-European *h₁ey- (“to move”). Cognate with Latin eō and Polish iść, both of the same meaning. The preterite form of this term, mäs-, is from Proto-Indo-European *mew- (“to move”), and as such the term is suppletive in conjugation.",
  "head_templates": [
    {
      "args": {
        "1": "txb",
        "2": "verb"
      },
      "expansion": "i-",
      "name": "head"
    }
  ],
  "lang": "Tocharian B",
  "lang_code": "txb",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Tocharian B entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "tags": [
            "possibly"
          ],
          "word": "imāne"
        },
        {
          "word": "yalle"
        },
        {
          "sense": "yalñe",
          "word": "yalñetstse"
        },
        {
          "sense": "yalñe",
          "word": "yalñeṣṣe"
        }
      ],
      "glosses": [
        "to go"
      ],
      "id": "en-i--txb-verb-gNM9bcDR",
      "links": [
        [
          "go",
          "go"
        ]
      ]
    }
  ],
  "word": "i-"
}

{
  "derived": [
    {
      "tags": [
        "possibly"
      ],
      "word": "imāne"
    },
    {
      "word": "yalle"
    },
    {
      "sense": "yalñe",
      "word": "yalñetstse"
    },
    {
      "sense": "yalñe",
      "word": "yalñeṣṣe"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "txb",
        "2": "ine-pro",
        "3": "*h₁ey-"
      },
      "expansion": "",
      "name": "root"
    },
    {
      "args": {
        "1": "txb",
        "2": "ine-toc-pro",
        "3": "*jä-"
      },
      "expansion": "Proto-Tocharian *jä-",
      "name": "inh"
    },
    {
      "args": {
        "1": "xto",
        "2": "i-"
      },
      "expansion": "Tocharian A i-",
      "name": "cog"
    },
    {
      "args": {
        "1": "txb",
        "2": "ine-pro",
        "3": "*h₁ey-",
        "4": "",
        "5": "to move"
      },
      "expansion": "Proto-Indo-European *h₁ey- (“to move”)",
      "name": "inh"
    },
    {
      "args": {
        "1": "la",
        "2": "eō"
      },
      "expansion": "Latin eō",
      "name": "cog"
    },
    {
      "args": {
        "1": "pl",
        "2": "iść"
      },
      "expansion": "Polish iść",
      "name": "cog"
    },
    {
      "args": {
        "1": "txb",
        "2": "mäs-"
      },
      "expansion": "mäs-",
      "name": "m"
    },
    {
      "args": {
        "1": "txb",
        "2": "ine-pro",
        "3": "*mew-",
        "4": "",
        "5": "to move"
      },
      "expansion": "Proto-Indo-European *mew- (“to move”)",
      "name": "der"
    },
    {
      "args": {
        "1": "suppletive"
      },
      "expansion": "suppletive",
      "name": "glossary"
    }
  ],
  "etymology_text": "From Proto-Tocharian *jä-, whence also Tocharian A i-, from Proto-Indo-European *h₁ey- (“to move”). Cognate with Latin eō and Polish iść, both of the same meaning. The preterite form of this term, mäs-, is from Proto-Indo-European *mew- (“to move”), and as such the term is suppletive in conjugation.",
  "head_templates": [
    {
      "args": {
        "1": "txb",
        "2": "verb"
      },
      "expansion": "i-",
      "name": "head"
    }
  ],
  "lang": "Tocharian B",
  "lang_code": "txb",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "Tocharian B entries with incorrect language header",
        "Tocharian B lemmas",
        "Tocharian B terms derived from Proto-Indo-European",
        "Tocharian B terms derived from Proto-Tocharian",
        "Tocharian B terms derived from the Proto-Indo-European root *h₁ey-",
        "Tocharian B terms inherited from Proto-Indo-European",
        "Tocharian B terms inherited from Proto-Tocharian",
        "Tocharian B verbs"
      ],
      "glosses": [
        "to go"
      ],
      "links": [
        [
          "go",
          "go"
        ]
      ]
    }
  ],
  "word": "i-"
}