There are 2 definitions of change up in English:

change up1

British Engage a higher gear in a vehicle or on a bicycle: what you notice with a diesel is the need to change up slightly earlier than in a petrol car
More example sentences
  • It certainly powers nicely through third and fourth gears before changing up to cruise in fifth, but the benefits of all-wheel drive don't really extend to the petrol pumps.
  • Responsive and smooth, what really makes it shine is the logic behind the semi-auto gearstick: forward to change down; backward to change up.
  • Having merged the acts of engaging the clutch and slotting the gear home, this car can change up or down in 100 milliseconds.
See parent entry: change

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Word of the day hubris
Pronunciation: ˈhjuːbrɪs
noun
excessive pride or self-confidence

There are 2 definitions of change up in English:

change-up2

Line breaks: change-up

noun

Baseball
An unexpectedly slow pitch designed to throw off the batter’s timing: the pitcher can add a change-up to his fastball
More example sentences
  • Both pitchers throw a fastball, curveball, and a change-up.
  • But I learned that I needed a change-up and that's been a big pitch for me.
  • His curveball doesn't drop much, his change-up stays pretty flat, and he has next to no movement on his ‘fastball.’

Definition of change up in: