"once and for all" meaning in English

{
  "etymology_text": ": once and for all < → δείτε τις λέξεις once, and, for και all",
  "forms": [
    {
      "form": "once and for all"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Ιδιωματισμοί (αγγλικά)",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "I am telling you once and for all you need to not do this.",
          "translation": "Σου λέω μια για πάντα ότι δεν πρέπει να το κάνεις αυτό."
        }
      ],
      "glosses": [
        "μια για πάντα"
      ],
      "id": "el-once_and_for_all-en-phrase-Ohtq-Lhl",
      "raw_tags": [
        "ιδιωματισμός"
      ]
    }
  ],
  "word": "once and for all"
}

{
  "etymology_text": ": once and for all < → δείτε τις λέξεις once, and, for και all",
  "forms": [
    {
      "form": "once and for all"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        "Ιδιωματισμοί (αγγλικά)"
      ],
      "examples": [
        {
          "text": "I am telling you once and for all you need to not do this.",
          "translation": "Σου λέω μια για πάντα ότι δεν πρέπει να το κάνεις αυτό."
        }
      ],
      "glosses": [
        "μια για πάντα"
      ],
      "raw_tags": [
        "ιδιωματισμός"
      ]
    }
  ],
  "word": "once and for all"
}