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IOU

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IOU/ˌaɪˌoʊˈjuː/noun
pluralIOUs
IOU
/ˌaɪˌoʊˈjuː/
noun
pluralIOUs
Learner's definition of IOU  
[count]informal
: a usually written promise to pay a debt
IOU is from the pronunciation of the phrase “I owe you.”
— often used figuratively
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