Remand, in general, means to send back. An appeals court may remand a case to the trial court for further action if it reverses the judgment of the lower court. It is a finding by an appellate court, which sends a case back to the trial court for further proceedings. The trial court must conduct further proceedings consistent with the appellate court's ruling.
In a criminal matter, a judge may remand into custody a person accused of a crime if, after a preliminary hearing, the judge finds that a there is reason to hold the accused for trial.