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]