"for the sake of it" meaning in English

{
  "etymology_text": ": for the sake of it < → δείτε τις λέξεις for, the, sake, of και it",
  "forms": [
    {
      "form": "for the sake of it"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "related": [
    {
      "word": "just for the sake of it"
    }
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Ιδιωματισμοί (αγγλικά)",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "He argues for the sake of it.",
          "translation": "Φέρνει αντιρρήσεις μόνο και μόνο για να συζητάει."
        }
      ],
      "glosses": [
        "μόνο και μόνο, χωρίς ιδιαίτερο λόγο"
      ],
      "id": "el-for_the_sake_of_it-en-phrase-LQW6c7Nj",
      "raw_tags": [
        "ιδιωματισμός"
      ]
    }
  ],
  "word": "for the sake of it"
}

{
  "etymology_text": ": for the sake of it < → δείτε τις λέξεις for, the, sake, of και it",
  "forms": [
    {
      "form": "for the sake of it"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "related": [
    {
      "word": "just for the sake of it"
    }
  ],
  "senses": [
    {
      "categories": [
        "Ιδιωματισμοί (αγγλικά)"
      ],
      "examples": [
        {
          "text": "He argues for the sake of it.",
          "translation": "Φέρνει αντιρρήσεις μόνο και μόνο για να συζητάει."
        }
      ],
      "glosses": [
        "μόνο και μόνο, χωρίς ιδιαίτερο λόγο"
      ],
      "raw_tags": [
        "ιδιωματισμός"
      ]
    }
  ],
  "word": "for the sake of it"
}