think better of something
Meaning: If you think better of something, you decide not to do it even though you'd made plans to do it.
- Danny was going to drop out of university and become a travel writer. But he thought better of quitting his studies and decided to finish his course.
- We were going to go to the beach, but we thought better of it when it started to rain.
June and Barry planned to take a cruise around the world. They thought better of it