Back-scratch is a term often used to describe the act of helping someone out while expecting something in return. However, there are many synonyms that can be used to describe the same concept using a different term. For instance, a favor, quid pro quo, reciprocity, or even scratch my back are different ways to describe the act of giving someone a hand but expecting something in return. Other terms that could be used include mutual aid, tit for tat, exchange of services, and more. Regardless of which synonym is used, the concept of giving and receiving favors is common in human interactions and communication.