keep an open mind —(also: have an open mind) be free from bias; avoid forming an opinion until one knows all the facts:
- Detectives said they were keeping an open mind whether the attacker is the same man.
open one’s mind—
1. reveal one’s inmost thoughts or sentiments:
- The day before he was due to return to France, he opened his mind to Emmie.
2. become receptive to smth. new or different:
- You will have to open your mind more easily to new ideas.