"mission impossible" meaning in French

{
  "forms": [
    {
      "form": "missions impossibles",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f",
        "2": "-",
        "3": "+"
      },
      "expansion": "mission impossible f (usually uncountable, plural missions impossibles)",
      "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": [
        {
          "text": "être mission impossible",
          "type": "example"
        }
      ],
      "glosses": [
        "mission impossible (extremely difficult, if not impossible, task)"
      ],
      "id": "en-mission_impossible-fr-noun-dTvF77lz",
      "links": [
        [
          "mission impossible",
          "mission impossible#English"
        ]
      ],
      "tags": [
        "feminine",
        "uncountable",
        "usually"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/mi.sjɔ̃ ɛ̃.pɔ.sibl/"
    }
  ],
  "word": "mission impossible"
}

{
  "forms": [
    {
      "form": "missions impossibles",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f",
        "2": "-",
        "3": "+"
      },
      "expansion": "mission impossible f (usually uncountable, plural missions impossibles)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "French countable nouns",
        "French entries with incorrect language header",
        "French feminine nouns",
        "French lemmas",
        "French multiword terms",
        "French nouns",
        "French nouns with red links in their headword lines",
        "French terms with IPA pronunciation",
        "French terms with usage examples",
        "French uncountable nouns",
        "Pages with 2 entries",
        "Pages with entries",
        "Requests for translations of French usage examples"
      ],
      "examples": [
        {
          "text": "être mission impossible",
          "type": "example"
        }
      ],
      "glosses": [
        "mission impossible (extremely difficult, if not impossible, task)"
      ],
      "links": [
        [
          "mission impossible",
          "mission impossible#English"
        ]
      ],
      "tags": [
        "feminine",
        "uncountable",
        "usually"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/mi.sjɔ̃ ɛ̃.pɔ.sibl/"
    }
  ],
  "word": "mission impossible"
}