Meaning of “curveball” in the English Dictionary

british dictionary

"curveball" in British English

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curveballnoun [ C ]

uk /ˈkɜːv.bɔːl/ us /ˈkɝːvbɑːl/ mainly US

(Definition of “curveball” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"curveball" in Business English

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curveballnoun [ S ]

also curve ball uk /ˈkɜːvbɔːl/ us 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” from the Cambridge Business English Dictionary © Cambridge University Press)