"how do you do" meaning in English

{
  "etymology_text": ": how do you do? < → δείτε τις λέξεις how, you και do & ?",
  "forms": [
    {
      "form": "how do you do?"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Επίσημοι όροι (αγγλικά)",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "→ δείτε τη φράση how are you"
      ],
      "id": "el-how_do_you_do-en-phrase-PH0gn4PL",
      "raw_tags": [
        "επίσημο"
      ]
    }
  ],
  "word": "how do you do"
}

{
  "etymology_text": ": how do you do? < → δείτε τις λέξεις how, you και do & ?",
  "forms": [
    {
      "form": "how do you do?"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        "Επίσημοι όροι (αγγλικά)"
      ],
      "glosses": [
        "→ δείτε τη φράση how are you"
      ],
      "raw_tags": [
        "επίσημο"
      ]
    }
  ],
  "word": "how do you do"
}