What does postpawn mean?

"Postpawn" is not a standard English Word; it seems to be a typographical error or a confusion with "postpone," which means to delay or reschedule an event or action to a later time. If you meant "pawn," it refers to the act of giving an item to a pawnbroker in exchange for a loan, with the item serving as collateral. If you have a different context in mind, please provide more details.