When a case has gone up to a higher court on appeal, and the appellate court finds that the trial court did something wrong, they will vacate (erase) the trial court's original verdict and remand...
Appellate and supreme courts do not generally make "findings of fact." That means they don't think about issues of witness credibility, specific damage amounts, what the conditions of a road were at...
To remand means to hand back to the care of a court or jurisdiction. So to remand to a high court means just that: to hand a case back to the high court.