"vanish into thin air" meaning in Anglais

{
  "categories": [
    {
      "kind": "other",
      "name": "Locutions verbales en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Anglais",
      "orig": "anglais",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "verb",
  "pos_title": "Locution verbale",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en anglais",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Exemples en anglais à traduire",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Métaphores en anglais",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "Conan Doyle, The Hound of the Baskervilles, 1902",
          "text": "“Now, you will observe that he could not have been on the staff of the hospital, since only a man well-established in a London practice could hold such a position, and such a one would not drift into the country. What was he, then? If he was in the hospital and yet not on the staff, he could only have been a house-surgeon or a house-physician—little more than a senior student. And he left five years ago—the date is on the stick. So your grave, middle-aged family practitioner vanishes into thin air, my dear Watson, and there emerges a young fellow under thirty, amiable, unambitious, absent-minded, and the possessor of a favourite dog, which I should describe roughly as being larger than a terrier and smaller than a mastiff.”"
        }
      ],
      "glosses": [
        "Se déguiser en courant d’air, s'évanouir, se volatiliser."
      ],
      "id": "fr-vanish_into_thin_air-en-verb-SCYnl-fk",
      "tags": [
        "figuratively"
      ]
    }
  ],
  "word": "vanish into thin air"
}

{
  "categories": [
    "Locutions verbales en anglais",
    "anglais"
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "verb",
  "pos_title": "Locution verbale",
  "senses": [
    {
      "categories": [
        "Exemples en anglais",
        "Exemples en anglais à traduire",
        "Métaphores en anglais"
      ],
      "examples": [
        {
          "ref": "Conan Doyle, The Hound of the Baskervilles, 1902",
          "text": "“Now, you will observe that he could not have been on the staff of the hospital, since only a man well-established in a London practice could hold such a position, and such a one would not drift into the country. What was he, then? If he was in the hospital and yet not on the staff, he could only have been a house-surgeon or a house-physician—little more than a senior student. And he left five years ago—the date is on the stick. So your grave, middle-aged family practitioner vanishes into thin air, my dear Watson, and there emerges a young fellow under thirty, amiable, unambitious, absent-minded, and the possessor of a favourite dog, which I should describe roughly as being larger than a terrier and smaller than a mastiff.”"
        }
      ],
      "glosses": [
        "Se déguiser en courant d’air, s'évanouir, se volatiliser."
      ],
      "tags": [
        "figuratively"
      ]
    }
  ],
  "word": "vanish into thin air"
}