Definition
A library tool used to imprint the date a book must be returned inside the front cover or pocket of a library book. The stamp helps patrons and librarians track when materials are due back.
Example Usage
The librarian stamped the due date in my book—I had three weeks to return it.
Origin
A standard library practice since the early 20th century when libraries needed efficient ways to track loan periods.
Fun Fact
Digital library systems have largely replaced physical due date stamps, though some libraries still maintain the tradition for aesthetic or accessibility reasons.
Source: Definition backfill (hailey)
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