Definition of change-up Change-up

We found 3 definitions of change-up from 2 different sources.

What does change-up mean?

Noun
change-up - a baseball thrown with little velocity when the batter is expecting a fastball
		change-of-pace, change-of-pace ball, off-speed pitch

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change-up (Noun)
An unexpected event.
change-up (Noun)
A pitch thrown with the arm motion of a fastball, but which travels at a much slower velocity because it is released without the fingers adding power to the delivery.