have (one's) day in court
To have the opportunity to voice one's complaints or explain one's actions. This phrase does not have to refer to an actual court appearance. You'll have your day in court, but for now, let your sister tell her side of the story. I'm glad I'm finally able to have my day in court and can refute those slanderous claims.
day in court, have one's
Have an opportunity to be heard, as in By asking Rob for an explanation the professor showed he was willing to let him have his day in court . This expression transfers the idea of a hearing in a court of law to more general use.