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English definition of “throw (sb) a curve (ball)”

throw (sb) a curve (ball)

mainly US and Australian English informal
to surprise someone with something that is difficult or unpleasant to deal with: The weather threw a curve at their barbecue and they had to eat indoors.Difficult situations and unpleasant experiencesAccidents and disastersPuzzle and confuseDifficult to understand
(Definition of throw (sb) a curve (ball) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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