This clue appeared in the NYT Crossword on Monday, June 22, 2026 (64 Down). The answer is hidden below until you want it. Monday puzzles are the easiest of the week, so the clue is likely a plain definition.
Answer length: 3 squares
First letter
I _ _
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About the answer
IOU as a word: An informal promissory note that is not a negotiable instrument.
IOU has been an answer 4 times in the NYT Crossword and Mini since December 3, 2025.
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