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English definition of “curveball”

curveball

noun [S] (also curve ball)     /ˈkɜːvbɔːl/ informal
something unexpected and difficult to deal with that changes a situation: The financial crisis has been an economic curve ball with global impact. New technologies have thrown a curveball at conventional risk assessment.
(Definition of curveball noun from the Cambridge Business English Dictionary © Cambridge University Press)
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