drop letter

noun
  1. a letter that is mailed to a local address at a post office without city delivery or a rural delivery service and must be picked up by the addressee.

Origin of drop letter

An Americanism dating back to 1835–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for drop letter

Historical Examples of drop letter