"-ку" meaning in Nivkh

{
  "etymology_number": "1",
  "forms": [
    {
      "form": "-ku",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "-ғу",
      "roman": "-γu",
      "tags": [
        "alternative"
      ]
    },
    {
      "form": "-ху",
      "roman": "-xu",
      "tags": [
        "alternative"
      ]
    },
    {
      "form": "-гу",
      "roman": "-gu",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "niv",
        "2": "suffix"
      },
      "expansion": "-ку (-ku)",
      "name": "head"
    }
  ],
  "lang": "Nivkh",
  "lang_code": "niv",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Amur Nivkh",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "North Sakhalin Nivkh",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "plural marker for nouns and verbs"
      ],
      "id": "en--ку-niv-suffix-YWsb~eoe",
      "raw_glosses": [
        "(Amur, North Sakhalin) plural marker for nouns and verbs"
      ],
      "related": [
        {
          "roman": "-kun",
          "tags": [
            "East",
            "Sakhalin",
            "South"
          ],
          "word": "-кун"
        }
      ],
      "tags": [
        "Amur",
        "North",
        "Sakhalin",
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/-ku/"
    }
  ],
  "word": "-ку"
}

{
  "etymology_number": "2",
  "forms": [
    {
      "form": "-ku",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "-ғу",
      "roman": "-γu",
      "tags": [
        "alternative"
      ]
    },
    {
      "form": "-гу",
      "roman": "-gu",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "niv",
        "2": "suffix"
      },
      "expansion": "-ку (-ku)",
      "name": "head"
    }
  ],
  "lang": "Nivkh",
  "lang_code": "niv",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "_dis": "34 66",
          "kind": "other",
          "name": "Nivkh entries with incorrect language header",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "ӻотьть (ġoțț) + -ку (-ku) → ӻотькудь (ġoțkud̦)",
          "type": "example"
        }
      ],
      "glosses": [
        "Causative suffix"
      ],
      "id": "en--ку-niv-suffix-QjNKYV2B",
      "links": [
        [
          "Causative",
          "causative"
        ]
      ],
      "tags": [
        "causative",
        "morpheme",
        "suffix"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/-ku/"
    }
  ],
  "word": "-ку"
}

{
  "categories": [
    "Nivkh entries with incorrect language header",
    "Nivkh lemmas",
    "Nivkh suffixes",
    "Nivkh terms with IPA pronunciation",
    "Pages with 2 entries",
    "Pages with entries"
  ],
  "etymology_number": "1",
  "forms": [
    {
      "form": "-ku",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "-ғу",
      "roman": "-γu",
      "tags": [
        "alternative"
      ]
    },
    {
      "form": "-ху",
      "roman": "-xu",
      "tags": [
        "alternative"
      ]
    },
    {
      "form": "-гу",
      "roman": "-gu",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "niv",
        "2": "suffix"
      },
      "expansion": "-ку (-ku)",
      "name": "head"
    }
  ],
  "lang": "Nivkh",
  "lang_code": "niv",
  "pos": "suffix",
  "related": [
    {
      "roman": "-kun",
      "tags": [
        "East",
        "Sakhalin",
        "South"
      ],
      "word": "-кун"
    }
  ],
  "senses": [
    {
      "categories": [
        "Amur Nivkh",
        "North Sakhalin Nivkh"
      ],
      "glosses": [
        "plural marker for nouns and verbs"
      ],
      "raw_glosses": [
        "(Amur, North Sakhalin) plural marker for nouns and verbs"
      ],
      "tags": [
        "Amur",
        "North",
        "Sakhalin",
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/-ku/"
    }
  ],
  "word": "-ку"
}

{
  "categories": [
    "Nivkh entries with incorrect language header",
    "Nivkh lemmas",
    "Nivkh suffixes",
    "Nivkh terms with IPA pronunciation",
    "Pages with 2 entries",
    "Pages with entries"
  ],
  "etymology_number": "2",
  "forms": [
    {
      "form": "-ku",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "-ғу",
      "roman": "-γu",
      "tags": [
        "alternative"
      ]
    },
    {
      "form": "-гу",
      "roman": "-gu",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "niv",
        "2": "suffix"
      },
      "expansion": "-ку (-ku)",
      "name": "head"
    }
  ],
  "lang": "Nivkh",
  "lang_code": "niv",
  "pos": "suffix",
  "senses": [
    {
      "examples": [
        {
          "text": "ӻотьть (ġoțț) + -ку (-ku) → ӻотькудь (ġoțkud̦)",
          "type": "example"
        }
      ],
      "glosses": [
        "Causative suffix"
      ],
      "links": [
        [
          "Causative",
          "causative"
        ]
      ],
      "tags": [
        "causative",
        "morpheme",
        "suffix"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/-ku/"
    }
  ],
  "word": "-ку"
}