IOU
noun/ˌaɪ əʊ ˈjuː/
/ˌaɪ əʊ ˈjuː/
(informal)- a written promise that you will pay somebody the money you owe them (a way of writing ‘I owe you’)
- an IOU for £100
Word Originlate 18th cent.: representing the pronunciation of I owe you.
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IOU