"quién sabe" meaning in Spanish

{
  "head_templates": [
    {
      "args": {
        "1": "es",
        "2": "phrase"
      },
      "expansion": "quién sabe",
      "name": "head"
    }
  ],
  "hyphenation": [
    "quién"
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Spanish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "name": "Spanish rhetorical questions",
          "parents": [
            "Rhetorical questions",
            "Idioms",
            "Questions",
            "Sentences",
            "Figures of speech",
            "Multiword terms",
            "Rhetoric",
            "Lemmas",
            "Language",
            "Communication",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "who knows?"
      ],
      "id": "en-quién_sabe-es-phrase-xiSsP6f2",
      "links": [
        [
          "who knows",
          "who knows"
        ]
      ],
      "raw_glosses": [
        "(rhetorical question) who knows?"
      ],
      "tags": [
        "rhetoric"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˌkjen ˈsabe/"
    },
    {
      "ipa": "[ˌkjẽn ˈsa.β̞e]"
    }
  ],
  "word": "quién sabe"
}

{
  "head_templates": [
    {
      "args": {
        "1": "es",
        "2": "phrase"
      },
      "expansion": "quién sabe",
      "name": "head"
    }
  ],
  "hyphenation": [
    "quién"
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Spanish entries with incorrect language header",
        "Spanish lemmas",
        "Spanish multiword terms",
        "Spanish phrases",
        "Spanish rhetorical questions",
        "Spanish terms with IPA pronunciation"
      ],
      "glosses": [
        "who knows?"
      ],
      "links": [
        [
          "who knows",
          "who knows"
        ]
      ],
      "raw_glosses": [
        "(rhetorical question) who knows?"
      ],
      "tags": [
        "rhetoric"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˌkjen ˈsabe/"
    },
    {
      "ipa": "[ˌkjẽn ˈsa.β̞e]"
    }
  ],
  "word": "quién sabe"
}