The phrase "scratch back" can be used to describe a variety of actions, from relieving an itch on your back to providing someone with a favor or support. If you're looking for synonyms for this phrase, consider terms like "lend a hand," "provide assistance," "give a boost," or "offer a helping hand." Other options could include "return a favor," "assist with something," or simply "help out." Ultimately, the phrase "scratch back" is just one way to describe providing support or easing someone's discomfort. By exploring synonyms and related phrases, you may be able to find new ways to express similar ideas and help others when they need it most.