- a receptacle or one of a series of pigeonholelike slots, as in an office, into which incoming mail is placed for pickup.
- drop(def 12).
Origin of mail drop
First recorded in 1970–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- mainly US and Canadian a receptacle or chute for mail
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012