"penalty envelope" meaning in English

{
  "forms": [
    {
      "form": "penalty envelopes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "penalty envelope (plural penalty envelopes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "American English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "The voter should take their absentee ballot to a post office, ask for a penalty envelope and mail it with the ballot inside.",
          "type": "example"
        }
      ],
      "glosses": [
        "An envelope whose mailing for an authorized purpose does not requiring postage, while its unauthorized use may be penalized."
      ],
      "id": "en-penalty_envelope-en-noun-i6e6rdNs",
      "links": [
        [
          "envelope",
          "envelope"
        ],
        [
          "authorized",
          "authorized"
        ],
        [
          "purpose",
          "purpose"
        ],
        [
          "postage",
          "postage"
        ]
      ],
      "raw_glosses": [
        "(US) An envelope whose mailing for an authorized purpose does not requiring postage, while its unauthorized use may be penalized."
      ],
      "tags": [
        "US"
      ]
    }
  ],
  "word": "penalty envelope"
}

{
  "forms": [
    {
      "form": "penalty envelopes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "penalty envelope (plural penalty envelopes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "American English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with usage examples"
      ],
      "examples": [
        {
          "text": "The voter should take their absentee ballot to a post office, ask for a penalty envelope and mail it with the ballot inside.",
          "type": "example"
        }
      ],
      "glosses": [
        "An envelope whose mailing for an authorized purpose does not requiring postage, while its unauthorized use may be penalized."
      ],
      "links": [
        [
          "envelope",
          "envelope"
        ],
        [
          "authorized",
          "authorized"
        ],
        [
          "purpose",
          "purpose"
        ],
        [
          "postage",
          "postage"
        ]
      ],
      "raw_glosses": [
        "(US) An envelope whose mailing for an authorized purpose does not requiring postage, while its unauthorized use may be penalized."
      ],
      "tags": [
        "US"
      ]
    }
  ],
  "word": "penalty envelope"
}