A note or paper attached to a bill of exchange or promissory note to provide additional endorsements or information when space runs out.
From French 'allonge' (extension, lengthening), from Old French 'alonger' (to lengthen). Entered English financial terminology in the 16th century through merchant trading practices.
Before photocopiers existed, when a bill of exchange got too many signatures, merchants would glue on extra paper—the allonge—like an ancient sticky note for official documents. Talk about medieval paperwork!
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