IOU Definition
īō-yo͝o
noun
An informally written, signed acknowledgment of a specified debt, characteristically bearing the letters IOU.
Webster's New World
Synonyms:
abbreviation
I owe you.
Customarily, if you borrow $10 for lunch from a coworker, writing IOU $10 on a yellow sticky note acts as a legal promissory note that you will repay said amount on payday.
Wiktionary
Origin of IOU
From the pronunciation of "I owe you", not the initial letters.
From Wiktionary
From the pronunciation of I owe you
From American Heritage Dictionary of the English Language, 5th Edition
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