a written acknowledgment of a debt, especially an informal one consisting only of the letters IOU, the sum owed, and the debtor’s signature.
a written promise or reminder to pay a debt

Abbreviation for “I owe you.” An IOU is a written statement of a borrower’s obligation to pay a debt.


A promise to pay; written acknowledgment of a debt: had won $800,000, in cash, not IOUs (1618+)
a note of debt (from “I owe you”)


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