/ wʊps; NAmE / exclamation
1.
used when sb has almost had an accident, broken sth, etc. :
Whoops! Careful, you almost spilt coffee everywhere.
2.
used when you have done sth embarrassing, said sth rude by accident, told a secret, etc. :
Whoops, you weren't supposed to hear that.
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WORD ORIGIN
1920s: probably an alteration of upsy-daisy ; compare with oops .