To date a document with a date that comes after the date it was actually written, or to occur at a later time than expected.
From 'after' plus 'date' (from Old French dater, from Latin data, meaning 'given'). Financial and legal terminology from medieval commerce when contracts needed precise temporal markers.
Postdating checks is the modern equivalent—and it's legally risky—but merchants have been trying to afterdate transactions for centuries to manage cash flow problems.
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