postage due stamp

noun

1. a stamp that is affixed to mail at a post office when prepayment of postage is insufficient, to indicate the amount that must be collected from the addressee.

postage due stamp

noun

1. a stamp affixed by a Post Office to a letter, parcel, etc, indicating that insufficient or no postage has been prepaid and showing the amount to be paid by the addressee on delivery

Word History and Origins

Origin of postage due stamp¹

An Americanism dating back to 1890–95