Boo-boo

There are a few possibilities for this:

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slip

owie

'boo-boo' is the definition.
(slip is a kind of boo-boo)

This is all the clue.

(Other definitions for slip that I've seen before include "Mistake (of tongue or pen)" , "Error; lose one's footing" , "Underwear" , "Mistake -- small piece of paper" , "Loose one's footing" .)

I've seen this clue in The New York Times.

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