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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
A presumably 'natural' exclamation, attested in writing since 1921. Related to or a variation of whoops (itself attested since 1933). A shortening of whoops-a-daisy, whoopsie-daisy, or oops-a-daisy, which in turn is a mispronunciation of ups-a-daisy or upsy-daisy.
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Classic usage
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