"je ne sais quoi" meaning in French

{
  "etymology_templates": [
    {
      "args": {
        "1": "I don't know what"
      },
      "expansion": "“I don't know what”",
      "name": "m-g"
    },
    {
      "args": {
        "1": "I don't know what"
      },
      "expansion": "Literally, “I don't know what”",
      "name": "lit"
    }
  ],
  "etymology_text": "Literally, “I don't know what”.",
  "forms": [
    {
      "form": "je ne sais quoi",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m",
        "2": "#"
      },
      "expansion": "je ne sais quoi m (plural je ne sais quoi)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "If you have it, you have it, Ella she has it. This I don't know what. That the others don't have.",
          "ref": "1987, Michel Berger (lyrics and music), “Ella, elle l'a”, in Babacar, performed by France Gall:",
          "text": "Si tu l’as, tu l’as, Ella elle l’a / Ce je ne sais quoi / Que d’autres n’ont pas",
          "type": "quote"
        }
      ],
      "glosses": [
        "a certain something, je ne sais quoi (intangible quality that makes something distinctive)"
      ],
      "id": "en-je_ne_sais_quoi-fr-noun-lDcovqh7",
      "links": [
        [
          "je ne sais quoi",
          "je ne sais quoi#English"
        ]
      ],
      "related": [
        {
          "word": "je ne sais pas"
        }
      ],
      "synonyms": [
        {
          "word": "Dieu sait quoi"
        },
        {
          "word": "on ne sait quoi"
        },
        {
          "word": "je-ne-sais-quoi"
        }
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ʒə n(ə) sɛ kwa/"
    },
    {
      "audio": "LL-Q150 (fra)-WikiLucas00-je ne sais quoi.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/0/0f/LL-Q150_%28fra%29-WikiLucas00-je_ne_sais_quoi.wav/LL-Q150_%28fra%29-WikiLucas00-je_ne_sais_quoi.wav.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/0/0f/LL-Q150_%28fra%29-WikiLucas00-je_ne_sais_quoi.wav/LL-Q150_%28fra%29-WikiLucas00-je_ne_sais_quoi.wav.ogg"
    },
    {
      "rhymes": "-a"
    }
  ],
  "word": "je ne sais quoi"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "I don't know what"
      },
      "expansion": "“I don't know what”",
      "name": "m-g"
    },
    {
      "args": {
        "1": "I don't know what"
      },
      "expansion": "Literally, “I don't know what”",
      "name": "lit"
    }
  ],
  "etymology_text": "Literally, “I don't know what”.",
  "forms": [
    {
      "form": "je ne sais quoi",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m",
        "2": "#"
      },
      "expansion": "je ne sais quoi m (plural je ne sais quoi)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "related": [
    {
      "word": "je ne sais pas"
    }
  ],
  "senses": [
    {
      "categories": [
        "French countable nouns",
        "French entries with incorrect language header",
        "French lemmas",
        "French masculine nouns",
        "French multiword terms",
        "French nouns",
        "French terms with IPA pronunciation",
        "French terms with quotations",
        "Pages with 2 entries",
        "Pages with entries",
        "Rhymes:French/a",
        "Rhymes:French/a/4 syllables"
      ],
      "examples": [
        {
          "english": "If you have it, you have it, Ella she has it. This I don't know what. That the others don't have.",
          "ref": "1987, Michel Berger (lyrics and music), “Ella, elle l'a”, in Babacar, performed by France Gall:",
          "text": "Si tu l’as, tu l’as, Ella elle l’a / Ce je ne sais quoi / Que d’autres n’ont pas",
          "type": "quote"
        }
      ],
      "glosses": [
        "a certain something, je ne sais quoi (intangible quality that makes something distinctive)"
      ],
      "links": [
        [
          "je ne sais quoi",
          "je ne sais quoi#English"
        ]
      ],
      "synonyms": [
        {
          "word": "Dieu sait quoi"
        },
        {
          "word": "on ne sait quoi"
        }
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ʒə n(ə) sɛ kwa/"
    },
    {
      "audio": "LL-Q150 (fra)-WikiLucas00-je ne sais quoi.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/0/0f/LL-Q150_%28fra%29-WikiLucas00-je_ne_sais_quoi.wav/LL-Q150_%28fra%29-WikiLucas00-je_ne_sais_quoi.wav.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/0/0f/LL-Q150_%28fra%29-WikiLucas00-je_ne_sais_quoi.wav/LL-Q150_%28fra%29-WikiLucas00-je_ne_sais_quoi.wav.ogg"
    },
    {
      "rhymes": "-a"
    }
  ],
  "synonyms": [
    {
      "word": "je-ne-sais-quoi"
    }
  ],
  "word": "je ne sais quoi"
}