change up

1. (intransitive)To throw a pitch at a much slower than expected speed.

   He changed up on Wilson after three fastballs and struck him out.

2. (intransitive)To confuse someone by doing something unexpected or in an unexpected way.

   I thought that we were going to study the project some more, but then he came back from the weekend and changed up, making it a top priority.

3. (informal, transitive)To vary.

   change it up

4. To change to a higher gear in a vehicle.

1. New changes have come up recently.

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2. For a change, I got up very early today.

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3. We need to change things up in this house.

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4. I’m ready to change things up.

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5. I wanted to change things up with my hairstyle.

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irregular

• change upTo throw a pitch at a much slower than expected speed.
• change outTo swap one thing for another; to switch out (something).
• change downTo change to a lower gear in a vehicle
• change overTo convert to, to make a transition from one system to another
• change aroundTo switch or rearrange.