"drop letter" meaning in English

{
  "forms": [
    {
      "form": "drop letters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "drop letter (plural drop letters)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "American English",
          "parents": [],
          "source": "w"
        },
        {
          "_dis": "91 9",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A letter mailed at a post office and either kept for general delivery, or delivered to a post office box, at that same post office."
      ],
      "id": "en-drop_letter-en-noun-2xRLBbax",
      "links": [
        [
          "letter",
          "letter"
        ],
        [
          "post office",
          "post office"
        ],
        [
          "general",
          "general"
        ],
        [
          "delivery",
          "delivery"
        ],
        [
          "post office box",
          "post office box"
        ]
      ],
      "raw_glosses": [
        "(US) A letter mailed at a post office and either kept for general delivery, or delivered to a post office box, at that same post office."
      ],
      "tags": [
        "US"
      ]
    },
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Typography",
          "orig": "en:Typography",
          "parents": [
            "Printing",
            "Writing",
            "Industries",
            "Human behaviour",
            "Language",
            "Business",
            "Human",
            "Communication",
            "Economics",
            "Society",
            "All topics",
            "Social sciences",
            "Fundamental",
            "Sciences"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A large letter at the beginning of a line of text, positioned in a decorative way below the baseline of the rest of the type."
      ],
      "id": "en-drop_letter-en-noun-S76anXk5",
      "links": [
        [
          "typography",
          "typography"
        ],
        [
          "baseline",
          "baseline"
        ]
      ],
      "raw_glosses": [
        "(typography) A large letter at the beginning of a line of text, positioned in a decorative way below the baseline of the rest of the type."
      ],
      "topics": [
        "media",
        "publishing",
        "typography"
      ]
    }
  ],
  "word": "drop letter"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns"
  ],
  "forms": [
    {
      "form": "drop letters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "drop letter (plural drop letters)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "American English"
      ],
      "glosses": [
        "A letter mailed at a post office and either kept for general delivery, or delivered to a post office box, at that same post office."
      ],
      "links": [
        [
          "letter",
          "letter"
        ],
        [
          "post office",
          "post office"
        ],
        [
          "general",
          "general"
        ],
        [
          "delivery",
          "delivery"
        ],
        [
          "post office box",
          "post office box"
        ]
      ],
      "raw_glosses": [
        "(US) A letter mailed at a post office and either kept for general delivery, or delivered to a post office box, at that same post office."
      ],
      "tags": [
        "US"
      ]
    },
    {
      "categories": [
        "en:Typography"
      ],
      "glosses": [
        "A large letter at the beginning of a line of text, positioned in a decorative way below the baseline of the rest of the type."
      ],
      "links": [
        [
          "typography",
          "typography"
        ],
        [
          "baseline",
          "baseline"
        ]
      ],
      "raw_glosses": [
        "(typography) A large letter at the beginning of a line of text, positioned in a decorative way below the baseline of the rest of the type."
      ],
      "topics": [
        "media",
        "publishing",
        "typography"
      ]
    }
  ],
  "word": "drop letter"
}