When an appellate court sends a case back to the trial court, it means the case is

Remanded

Explanation:

Through remand court processes, the higher courts get to send cases back to lower courts for the lower courts to further to act on the cases. In the United States of America for example, when a new trial is required in a case, the appellate courts can send those cases [remand] back to the district courts for them to review and act on them accordingly. The higher courts can rightly remand cases when they are not able to finally determine the outcome of the case.