/ ʊps; NAmE ; uːps/ exclamation
1.
used when sb has almost had an accident, broken sth, etc. :
Oops! I almost spilled the wine.
2.
used when you have done sth embarrassing, said sth rude by accident, told a secret, etc. :
Oops, I shouldn't have said that.
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WORD ORIGIN
natural exclamation: first recorded in English in the 1930s.