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2. Crossword clues
3. Informal debt instrument

Alternative clues for the word iou

• Note to be used later
• Promise of a sort
• Promissory note,so to speak
• Gambler's note, slangily
• Gamblers promise, slangily
• Note to hit some one back
• Written reminder of debt
• Marker for a debtor
• Letters often followed by a number
• Borrower's letters