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IOU

1 ENTRIES FOUND:
IOU /ˌaɪˌoʊˈjuː/ noun
plural IOUs
IOU
/ˌaɪˌoʊˈjuː/
noun
plural IOUs
Britannica Dictionary definition of IOU
[count] informal
: a usually written promise to pay a debt
often used figuratively
IOU is from the pronunciation of the phrase “I owe you.”