The term 'turn back' can be expressed in a variety of ways, including 'REPEL' (5 letters), 'SPURN' (5 letters), 'RELAPSE' (7 letters), 'RETURN' (6 letters), 'REGRESS' (7 letters), 'REVERT' (6 letters), 'zag' (3 letters), 'REPULSE' (7 letters), 'REVERSE' (7 letters), 'aboutface' (9 letters), and 'retrovert' (9 letters). All of these terms refer to the act of returning to a previous state or position, either physically or metaphorically. For example, 'REPEL' means to push away or reject something, while 'RETURN' means to go back to a place or situation. Similarly, 'REVERT' means to go back to an earlier form or condition, and 'REVERSE' means to turn around or change direction.