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"ouch" is also used as a crossword clue. If that's what you saw, the answer is often ow (2 letters).
Definitions
Expression of sudden physical pain.
Used in a sentence
“Ouch! You stepped on my toe! That hurt!”
“Ouch! Her sunburn looks awful.”
“Ouch. How could you say that?”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Pain cry”4 letters
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