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The Collaborative International Dictionary
change-of-pace

change-of-pace \change-of-pace\ n. (Baseball) a baseball pitch thrown with little velocity when the batter is expecting a fastball; -- called also change-up.

Syn: change-up, change-of-pace ball, off-speed pitch.

WordNet
change-of-pace

n. a baseball thrown with little velocity when the batter is expecting a fastball [syn: change-up, change-of-pace ball, off-speed pitch]