Changeup Definition
 chānjŭp 
    noun
  
 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.
 American Heritage 
Other Word Forms of Changeup
Noun
Singular:
 changeupPlural:
 changeupsOrigin of Changeup
- Alteration of change-of-pace - From American Heritage Dictionary of the English Language, 5th Edition 
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