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English definition of “curveball”

curveball

noun [C]     /ˈkɜːv.bɔːl/ US  /ˈkɝːvbɑːl/ mainly US
in the sport of baseball, a throw in which the ball curves as it moves towards the player with the batBaseball and roundersGeneral terms used in ball sports something such as a question or event that is surprising or unexpected, and therefore difficult to deal with: Every so often life will throw you a curveball.
(Definition of curveball noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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