changeup
noun
change·up ˈchānj-ˌəp 
: a slow pitch in baseball thrown with the same motion as a fastball in order to deceive the batter
Example Sentences
The batter struck out on a changeup.
Recent Examples on the Web Cora noted how Bello mainly worked changeup and sinker when he was initially called up for his major league debut July 6 vs. Tampa Bay. 
Julian Mcwilliams, BostonGlobe.com, 3 Sep. 2022 Castillo debuted with the Reds in 2017 as a mid-tier prospect with a changeup and a sinker that gave him some upside. Charlie Goldsmith, The Enquirer, 28 July 2022 The lefty's imposing stature on the mound combined with a sharp command of his changeup and slider had A&M batters looking uncomfortable in the box. Brooks Holton, The Courier-Journal, 13 June 2022 Skubal induced 13 swings and misses, doing so with all his pitches: two four-seamers, four sliders, two sinkers, four changeup and one knuckle curve. Evan Petzold, Detroit Free Press, 2 June 2022 Miller saw a curveball, changeup and slider building a 2-2 count, then chopped a fastball for an RBI single. Matt Kawahara, San Francisco Chronicle, 29 May 2022 Jared Walsh hammered Manning's hanging changeup with a 110 mph exit velocity for a solo home run to right field with two outs. Evan Petzold, Detroit Free Press, 20 Aug. 2022 After getting Charles Leblanc to pop out to first and striking out Peyton Burdick, Anderson caught too much of the plate with an 0-and-2 changeup that rookie Jerar Encarnacion drove to left-center for a double and a 1-0 lead. Mike Digiovanna, Los Angeles Times, 19 Aug. 2022 Visible, a virtual network operator owned by Verizon, announced this changeup of rate plans Wednesday. Rob Pegoraro, PCMAG, 17 Aug. 2022 See More
Julian Mcwilliams, BostonGlobe.com, 3 Sep. 2022 Castillo debuted with the Reds in 2017 as a mid-tier prospect with a changeup and a sinker that gave him some upside. Charlie Goldsmith, The Enquirer, 28 July 2022 The lefty's imposing stature on the mound combined with a sharp command of his changeup and slider had A&M batters looking uncomfortable in the box. Brooks Holton, The Courier-Journal, 13 June 2022 Skubal induced 13 swings and misses, doing so with all his pitches: two four-seamers, four sliders, two sinkers, four changeup and one knuckle curve. Evan Petzold, Detroit Free Press, 2 June 2022 Miller saw a curveball, changeup and slider building a 2-2 count, then chopped a fastball for an RBI single. Matt Kawahara, San Francisco Chronicle, 29 May 2022 Jared Walsh hammered Manning's hanging changeup with a 110 mph exit velocity for a solo home run to right field with two outs. Evan Petzold, Detroit Free Press, 20 Aug. 2022 After getting Charles Leblanc to pop out to first and striking out Peyton Burdick, Anderson caught too much of the plate with an 0-and-2 changeup that rookie Jerar Encarnacion drove to left-center for a double and a 1-0 lead. Mike Digiovanna, Los Angeles Times, 19 Aug. 2022 Visible, a virtual network operator owned by Verizon, announced this changeup of rate plans Wednesday. Rob Pegoraro, PCMAG, 17 Aug. 2022 See More Word History
First Known Use
circa 1943, in the meaning defined above