"Frank discussion" refers to a conversation where people express their opinions or ideas openly and honestly, without holding back or being afraid of offense. Full definition
Having frank discussions about how you both want to handle the various situations that arise raising children can help you create a parenting plan. (thespruce.com)
At some point, I will need to have a very frank discussion with this person about my own career plans, and my thoughts on this selection process. (careerdigital.com)
In a courtroom, when attorneys and judges have sidebar conferences, they engage in frank discussion of a live legal issue. (lawsitesblog.com)