(baseball) A forespin pitch thrown by rotating the index and middle fingers down and resulting in motion down "curve".
He bit on a curveball in the dirt.
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(by extension, chiefly, US) An unexpected turn of events initiated by an opponent or chance; an exception or outlier.
Life has thrown him a few curveballs.
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(baseball) To throw a curveball.
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Add your own interpretation of "curveball".
Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.