letter drop
- (in a door or partition) a slot through which letters can be pushed.
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Origin of letter drop
An Americanism dating back to 1885–90
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for letter drop
Historical Examples
He heard the postman's step in the hall and saw the envelopes begin to shuttle themselves through the slit of his letter-drop.
McTeagueFrank Norris