The term 'move backward' can be expressed in several ways. The 6-letter solution is 'RECEDE, ' which means to move away from a place or position. The 7-letter solutions are 'RETREAT' and 'REVERSE, ' which both mean to go back in the opposite direction. The 10-letter solution is 'RETROGRADE, ' which means to move in the opposite direction of the usual one. All of these words refer to the same concept of moving in a direction opposite to the one that was previously taken.