"postage due" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "postage due (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "derived": [
        {
          "word": "postage due stamp"
        },
        {
          "word": "postage-due stamp"
        }
      ],
      "glosses": [
        "Indicating that insufficient or no postage has been prepaid for the delivery of an item of mail."
      ],
      "id": "en-postage_due-en-adj-2PYQxp1r",
      "links": [
        [
          "insufficient",
          "insufficient#English"
        ],
        [
          "postage",
          "postage#English"
        ],
        [
          "prepaid",
          "prepay#English"
        ],
        [
          "delivery",
          "delivery#English"
        ],
        [
          "mail",
          "mail#English"
        ]
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "postage due"
}

{
  "forms": [
    {
      "form": "postage dues",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "postage due (plural postage dues)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Philately",
          "orig": "en:Philately",
          "parents": [
            "Hobbies",
            "Recreation",
            "Human activity",
            "Human behaviour",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "_dis": "32 68",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w+disamb"
        },
        {
          "_dis": "32 68",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "32 68",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "37 63",
          "kind": "topical",
          "langcode": "en",
          "name": "Post",
          "orig": "en:Post",
          "parents": [
            "Communication",
            "All topics",
            "Fundamental"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A postage due stamp."
      ],
      "id": "en-postage_due-en-noun-X7vy5ljl",
      "links": [
        [
          "philately",
          "philately"
        ],
        [
          "postage due stamp",
          "postage due stamp"
        ]
      ],
      "raw_glosses": [
        "(philately) A postage due stamp."
      ],
      "topics": [
        "hobbies",
        "lifestyle",
        "philately"
      ]
    }
  ],
  "word": "postage due"
}

{
  "categories": [
    "English adjectives",
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "English uncomparable adjectives",
    "Pages with 1 entry",
    "Pages with entries",
    "en:Post"
  ],
  "derived": [
    {
      "word": "postage due stamp"
    },
    {
      "word": "postage-due stamp"
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "postage due (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "glosses": [
        "Indicating that insufficient or no postage has been prepaid for the delivery of an item of mail."
      ],
      "links": [
        [
          "insufficient",
          "insufficient#English"
        ],
        [
          "postage",
          "postage#English"
        ],
        [
          "prepaid",
          "prepay#English"
        ],
        [
          "delivery",
          "delivery#English"
        ],
        [
          "mail",
          "mail#English"
        ]
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "postage due"
}

{
  "categories": [
    "English adjectives",
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "English uncomparable adjectives",
    "Pages with 1 entry",
    "Pages with entries",
    "en:Post"
  ],
  "forms": [
    {
      "form": "postage dues",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "postage due (plural postage dues)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "en:Philately"
      ],
      "glosses": [
        "A postage due stamp."
      ],
      "links": [
        [
          "philately",
          "philately"
        ],
        [
          "postage due stamp",
          "postage due stamp"
        ]
      ],
      "raw_glosses": [
        "(philately) A postage due stamp."
      ],
      "topics": [
        "hobbies",
        "lifestyle",
        "philately"
      ]
    }
  ],
  "word": "postage due"
}