1
general::
Phrase(s): *an open mind
a mind or attitude that is open to new ideas and opinions. (*Typically: get ~; have ~; keep ~.) • Please try to be nice and keep an open mind. It’s all not as bad as you think.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
A mind receptive to different opinions and ideas, as in Her open mind could see merit in the new method. This phrase is often put as keep an open mind, as in The judge cautioned the jury to keep an open mind while hearing the evidence. [First half of 1800s]
American Heritage Idioms