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3. Promissory note, slangily

Alternative clues for the word iou

• Unofficial promissory note
• All-vowel vow
• Paper in lieu of payment
• Marker in a poker pot
• Gambler's debt, so to speak
• Note traded for bills
• Letters a collector receives?
• Slip in the pot, occasionally
• Letters for those in the hole
• Note from a busted card player