curveball

or curve ball

[ kurv-bawl ]
/ ˈkɜrvˌbɔl /

noun Baseball.

a pitch with a downward spin that causes the ball to drop and veer as it approaches home plate, away from the side from which it was thrown: He started perfecting his curveball during his junior year in high school.

Origin of curveball

An Americanism dating back to 1875–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for curveball

curve ball

noun

baseball a ball pitched in a curving path so as to make it more difficult to hit
informal something deceptivehis wholesome image was a curve ball thrown to deceive the public
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012