"-pu" meaning in Unami

{
  "etymology_templates": [
    {
      "args": {
        "1": "unm",
        "2": "-pwi",
        "3": "-w",
        "pos1": "verb suffix",
        "pos2": "third-person suffix",
        "t1": "to eat"
      },
      "expansion": "-pwi (“to eat”, verb suffix) + -w (third-person suffix)",
      "name": "suffix"
    }
  ],
  "etymology_text": "From -pwi (“to eat”, verb suffix) + -w (third-person suffix).",
  "head_templates": [
    {
      "args": {
        "1": "unm",
        "2": "verb form"
      },
      "expansion": "-pu",
      "name": "head"
    }
  ],
  "lang": "Unami",
  "lang_code": "unm",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Unami entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Unami terms suffixed with -w",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "-pwi"
        }
      ],
      "glosses": [
        "third-person singular of -pwi"
      ],
      "id": "en--pu-unm-verb-piQR9GH~",
      "links": [
        [
          "-pwi",
          "-pwi#Unami"
        ]
      ],
      "tags": [
        "form-of",
        "singular",
        "third-person"
      ]
    }
  ],
  "word": "-pu"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "unm",
        "2": "-pwi",
        "3": "-w",
        "pos1": "verb suffix",
        "pos2": "third-person suffix",
        "t1": "to eat"
      },
      "expansion": "-pwi (“to eat”, verb suffix) + -w (third-person suffix)",
      "name": "suffix"
    }
  ],
  "etymology_text": "From -pwi (“to eat”, verb suffix) + -w (third-person suffix).",
  "head_templates": [
    {
      "args": {
        "1": "unm",
        "2": "verb form"
      },
      "expansion": "-pu",
      "name": "head"
    }
  ],
  "lang": "Unami",
  "lang_code": "unm",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Unami entries with incorrect language header",
        "Unami non-lemma forms",
        "Unami terms suffixed with -w",
        "Unami verb forms"
      ],
      "form_of": [
        {
          "word": "-pwi"
        }
      ],
      "glosses": [
        "third-person singular of -pwi"
      ],
      "links": [
        [
          "-pwi",
          "-pwi#Unami"
        ]
      ],
      "tags": [
        "form-of",
        "singular",
        "third-person"
      ]
    }
  ],
  "word": "-pu"
}