"entre quatre yeux" meaning in French

{
  "head_templates": [
    {
      "args": {},
      "expansion": "entre quatre yeux",
      "name": "fr-adv"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "adv",
  "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 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "one-to-one, describing a meeting between just two persons"
      ],
      "id": "en-entre_quatre_yeux-fr-adv-NWUUwvQN",
      "links": [
        [
          "one-to-one",
          "one-to-one"
        ]
      ],
      "raw_glosses": [
        "(informal) one-to-one, describing a meeting between just two persons"
      ],
      "synonyms": [
        {
          "word": "entre quatre-z-yeux"
        },
        {
          "word": "entre quat’z’yeux"
        }
      ],
      "tags": [
        "informal"
      ],
      "wikipedia": [
        "Académie française"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ɑ̃.tʁə ka.tʁə.z‿jø/"
    },
    {
      "ipa": "/ɑ̃.tʁə kat.z‿jø/"
    },
    {
      "ipa": "/ɑ̃.tʁə ka.tʁ‿jø/"
    },
    {
      "ipa": "/ɑ̃.tʁə ka.tʁə jø/"
    }
  ],
  "word": "entre quatre yeux"
}

{
  "head_templates": [
    {
      "args": {},
      "expansion": "entre quatre yeux",
      "name": "fr-adv"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "French adverbs",
        "French entries with incorrect language header",
        "French informal terms",
        "French lemmas",
        "French multiword terms",
        "French terms with IPA pronunciation",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "one-to-one, describing a meeting between just two persons"
      ],
      "links": [
        [
          "one-to-one",
          "one-to-one"
        ]
      ],
      "raw_glosses": [
        "(informal) one-to-one, describing a meeting between just two persons"
      ],
      "tags": [
        "informal"
      ],
      "wikipedia": [
        "Académie française"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ɑ̃.tʁə ka.tʁə.z‿jø/"
    },
    {
      "ipa": "/ɑ̃.tʁə kat.z‿jø/"
    },
    {
      "ipa": "/ɑ̃.tʁə ka.tʁ‿jø/"
    },
    {
      "ipa": "/ɑ̃.tʁə ka.tʁə jø/"
    }
  ],
  "synonyms": [
    {
      "word": "entre quatre-z-yeux"
    },
    {
      "word": "entre quat’z’yeux"
    }
  ],
  "word": "entre quatre yeux"
}