"come non detto" meaning in Italian

{
  "categories": [
    {
      "_dis": "0 0 0",
      "kind": "topical",
      "langcode": "it",
      "name": "Military",
      "orig": "it:Military",
      "parents": [
        "Society",
        "All topics",
        "Fundamental"
      ],
      "source": "w+disamb"
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "it",
        "2": "interjection"
      },
      "expansion": "come non detto",
      "name": "head"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "intj",
  "related": [
    {
      "_dis1": "45 55 0",
      "word": "ordine annullato"
    }
  ],
  "senses": [
    {
      "categories": [
        {
          "_dis": "63 37 0",
          "kind": "other",
          "name": "Italian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "don't mention it"
      ],
      "id": "en-come_non_detto-it-intj-swHjjwNG",
      "links": [
        [
          "don't mention it",
          "don't mention it"
        ]
      ]
    },
    {
      "glosses": [
        "forget it (as if I had not said)"
      ],
      "id": "en-come_non_detto-it-intj-Ya0R92ye",
      "links": [
        [
          "forget it",
          "forget it"
        ]
      ]
    },
    {
      "glosses": [
        "as you were"
      ],
      "id": "en-come_non_detto-it-intj-LtMLORUK",
      "links": [
        [
          "as you were",
          "as you were"
        ]
      ]
    }
  ],
  "word": "come non detto"
}

{
  "categories": [
    "Italian entries with incorrect language header",
    "Italian interjections",
    "Italian lemmas",
    "Italian multiword terms",
    "it:Military"
  ],
  "head_templates": [
    {
      "args": {
        "1": "it",
        "2": "interjection"
      },
      "expansion": "come non detto",
      "name": "head"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "intj",
  "related": [
    {
      "word": "ordine annullato"
    }
  ],
  "senses": [
    {
      "glosses": [
        "don't mention it"
      ],
      "links": [
        [
          "don't mention it",
          "don't mention it"
        ]
      ]
    },
    {
      "glosses": [
        "forget it (as if I had not said)"
      ],
      "links": [
        [
          "forget it",
          "forget it"
        ]
      ]
    },
    {
      "glosses": [
        "as you were"
      ],
      "links": [
        [
          "as you were",
          "as you were"
        ]
      ]
    }
  ],
  "word": "come non detto"
}