Wiktionary
vb. (context transitive English) To change one's mind concerning, especially to decide against.
Usage examples of "think better of".
Only Sam was doubtful: he at any rate still thought boats as bad as wild horses, or worse, and not all the dangers that he had survived made him think better of them.
Hiram opened his lips as though it was his intent to answer, then seemed to think better of it and contented himself by nodding his head.
Maybe it was just that he was handsome and had broad shoulders, but she liked to think better of herself.
For a moment, the giant Thracian seemed on the verge of uttering one of his frequent philosophical homilies, but Valentinian's ferocious glare made him think better of it.
He took a step toward the Swenses, then pretended to think better of it and began backing up again.
You may yet think better of the lonely old Sire de Maletroit, and the honour of his house may one day be your own.