drop letter

noun

Definition of drop letter 

1 : a letter mailed at a post office not having carrier service and addressed locally to someone who is to call for it at the same office

2 Canada : a letter mailed at or in the delivery area of the same post office from which it will be delivered

3 : an initial letter (as at the beginning of a chapter in a book) that extends downward to a depth of two or more text lines

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