"To the rear" is a phrase commonly used to indicate direction towards the back or behind. However, there are several synonyms that can be used to convey the same meaning. One such synonym is "backwards," which can be used to indicate movement in the opposite direction away from the front. Other synonyms include "rearward," "behind," "backside," "hindmost," and "posterior." These words can be used interchangeably depending on the context of the sentence. For instance, instead of saying "move to the rear of the line," one can say "move behind the line" or "move to the back of the line".