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IOU

noun [C]
 
 
/ˌaɪ.əʊˈjuː/ US  /-oʊˈ-/

Definition

abbreviation for I owe you: a written promise to pay back a debt: Here's an IOU for the fiver you lent me. I'll pay you back on Monday.Borrowing, lending and debt
(Definition of IOU noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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