A "motion for a new trial" is a formal request made to a court, asking for a new trial to be conducted. This motion is typically filed after a verdict has been reached, and it argues that there were significant errors during the original trial that affected the outcome. Common reasons for filing this motion include improper jury instructions, newly discovered evidence, or misconduct by the parties involved. If the court grants the motion, it can lead to a retrial of the case, allowing both sides to present their arguments again. The decision to grant or deny the motion is at the discretion of the judge, who will review the reasons provided and determine if a new trial is warranted.