"under seal" meaning in English

{
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      "expansion": "under seal",
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
    {
      "examples": [
        {
          "text": "The letter was delivered under seal."
        }
      ],
      "glosses": [
        "Bearing a seal."
      ],
      "id": "en-under_seal-en-prep_phrase-Hxsm0XIq"
    },
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Law",
          "orig": "en:Law",
          "parents": [
            "Justice",
            "Society",
            "All topics",
            "Fundamental"
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          "source": "w"
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        {
          "_dis": "0 100",
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          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "The terms of the settlement will remain under seal indefinitely."
        },
        {
          "ref": "2023 July 14, Brittney Mejia, Libor Jany, Richard Winton, “LAPD refused to ID officers behind a huge fireworks explosion. Now we have their names”, in Los Angeles Times",
          "text": "Other members of the LAPD who were involved in the disaster have also remained anonymous, their discipline under seal.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Legally bound not to be disclosed."
      ],
      "id": "en-under_seal-en-prep_phrase-wuwEnL8b",
      "links": [
        [
          "law",
          "law#English"
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      ],
      "raw_glosses": [
        "(law) Legally bound not to be disclosed."
      ],
      "topics": [
        "law"
      ]
    }
  ],
  "word": "under seal"
}

{
  "categories": [
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English prepositional phrases"
  ],
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prepositional phrase"
      },
      "expansion": "under seal",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
    {
      "examples": [
        {
          "text": "The letter was delivered under seal."
        }
      ],
      "glosses": [
        "Bearing a seal."
      ]
    },
    {
      "categories": [
        "English terms with quotations",
        "en:Law"
      ],
      "examples": [
        {
          "text": "The terms of the settlement will remain under seal indefinitely."
        },
        {
          "ref": "2023 July 14, Brittney Mejia, Libor Jany, Richard Winton, “LAPD refused to ID officers behind a huge fireworks explosion. Now we have their names”, in Los Angeles Times",
          "text": "Other members of the LAPD who were involved in the disaster have also remained anonymous, their discipline under seal.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Legally bound not to be disclosed."
      ],
      "links": [
        [
          "law",
          "law#English"
        ]
      ],
      "raw_glosses": [
        "(law) Legally bound not to be disclosed."
      ],
      "topics": [
        "law"
      ]
    }
  ],
  "word": "under seal"
}