"niin kai" meaning in Finnish

{
  "etymology_text": "Literally, niin (“so, thus”) + kai (“maybe”).",
  "head_templates": [
    {
      "args": {
        "1": "fi",
        "2": "phrase",
        "head": "niin kai"
      },
      "expansion": "niin kai",
      "name": "head"
    }
  ],
  "lang": "Finnish",
  "lang_code": "fi",
  "pos": "phrase",
  "senses": [
    {
      "categories": [],
      "examples": [
        {
          "english": "What? Did you drop your phone into water? --Yes, I'm afraid so.",
          "text": "Mitä? Tippuiko puhelimesi veteen? --Niin kai.",
          "type": "example"
        },
        {
          "english": "Do we really have to do every one by hand? --Yes, I'm afraid so.",
          "text": "Pitääkö meidän tehdä kaikki käsin? --Niin kai.",
          "type": "example"
        }
      ],
      "glosses": [
        "I am afraid so"
      ],
      "id": "en-niin_kai-fi-phrase-SmgiVRer",
      "links": [
        [
          "I am afraid so",
          "I am afraid so"
        ]
      ]
    }
  ],
  "word": "niin kai"
}

{
  "etymology_text": "Literally, niin (“so, thus”) + kai (“maybe”).",
  "head_templates": [
    {
      "args": {
        "1": "fi",
        "2": "intj"
      },
      "expansion": "niin kai",
      "name": "head"
    }
  ],
  "lang": "Finnish",
  "lang_code": "fi",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        {
          "_dis": "85 15",
          "kind": "other",
          "name": "Finnish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "100 0",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "100 0",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "english": "I'll quit smoking. --Yeah, I bet!",
          "text": "Lopetan tupakanpolton. --Niin kai!",
          "type": "example"
        }
      ],
      "glosses": [
        "used to express disbelief"
      ],
      "id": "en-niin_kai-fi-intj-BZ9wtJf2"
    }
  ],
  "word": "niin kai"
}

{
  "categories": [
    "Finnish entries with incorrect language header",
    "Finnish interjections",
    "Finnish lemmas",
    "Finnish multiword terms",
    "Finnish phrases",
    "Finnish terms with redundant head parameter",
    "Pages with 1 entry",
    "Pages with entries"
  ],
  "etymology_text": "Literally, niin (“so, thus”) + kai (“maybe”).",
  "head_templates": [
    {
      "args": {
        "1": "fi",
        "2": "phrase",
        "head": "niin kai"
      },
      "expansion": "niin kai",
      "name": "head"
    }
  ],
  "lang": "Finnish",
  "lang_code": "fi",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        "Finnish terms with usage examples"
      ],
      "examples": [
        {
          "english": "What? Did you drop your phone into water? --Yes, I'm afraid so.",
          "text": "Mitä? Tippuiko puhelimesi veteen? --Niin kai.",
          "type": "example"
        },
        {
          "english": "Do we really have to do every one by hand? --Yes, I'm afraid so.",
          "text": "Pitääkö meidän tehdä kaikki käsin? --Niin kai.",
          "type": "example"
        }
      ],
      "glosses": [
        "I am afraid so"
      ],
      "links": [
        [
          "I am afraid so",
          "I am afraid so"
        ]
      ]
    }
  ],
  "word": "niin kai"
}

{
  "categories": [
    "Finnish entries with incorrect language header",
    "Finnish interjections",
    "Finnish lemmas",
    "Finnish multiword terms",
    "Finnish phrases",
    "Finnish terms with redundant head parameter",
    "Pages with 1 entry",
    "Pages with entries"
  ],
  "etymology_text": "Literally, niin (“so, thus”) + kai (“maybe”).",
  "head_templates": [
    {
      "args": {
        "1": "fi",
        "2": "intj"
      },
      "expansion": "niin kai",
      "name": "head"
    }
  ],
  "lang": "Finnish",
  "lang_code": "fi",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        "Finnish terms with usage examples"
      ],
      "examples": [
        {
          "english": "I'll quit smoking. --Yeah, I bet!",
          "text": "Lopetan tupakanpolton. --Niin kai!",
          "type": "example"
        }
      ],
      "glosses": [
        "used to express disbelief"
      ]
    }
  ],
  "word": "niin kai"
}