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n. Baseball
A pitch thrown with the arm motion of a fastball but traveling at a slower speed so as to cause the batter to swing prematurely.

[Alteration of change-of-pace.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
But the first changeup I threw him that doesn't usually happen on the first changeup I throw to a guy but it just shows he's a good hitter.
After surrendering a home run to Wilmer Flores, Sabathia induced Murphy to swing and miss at a changeup to end the inning.
Ryu threw a first-pitch strike with a fastball and got Kang to swing on a changeup. After a cutter missed the zone, Ryu offered another changeup to Kang, who fanned on the pitch for the strikeout.
The next instalment in the series, Metro Exodus, based again on the novels of Dmitry Glukhovsky, is a welcome changeup from the first two in that we have plenty of vast open space to explore.
And apparently, the 7-foot-3 cager was not in line with the Knicks' plans and New York opted to make a changeup. But what was that reason?
Sure enough, he threw me a changeup that at some point I took.
Weeks go by and having ball practices all the time gets to be a little boring so this is a changeup that keeps the guys fresh and ready." How did the Risers react to this training method?
'We wanted to make sure we executed well against their changeup defense so we're quite happy with the fact that we addressed those three things,' added Arespacochaga whose team converted on a 34-of-71 clip while holding UE to 28-of-61 shooting.
"I just think it was a changeup, maybe caught it out front a little bit," Bradley said of his 15th homer of the year.
M2 EQUITYBITES-August 30, 2017-Digital Agency Enradius Expands in Washington, DC Area with Acquisition of Changeup Marketing
Another changeup will then occur 24 September, with the appointment of Judge Mounir Mohammed Sayed as the head of the Court of Appeals in Ismailia; Judge Mahmoud Sami Ismail as the head of the Beni Suef Court of Appeals; Judge Adel Abdel Samiea as that of Assiut's; and Judge Mohammed Abdullah Khalaf Allah as the head of the Court of Appeals in Qena.