There are several synonyms for the phrase "avoid disappointment" that can be used depending on the context. The most common synonyms are "prevent letdown," "escape dissatisfaction," and "avert regret." Another option is to use the phrase "minimize the risk of disappointment," which implies taking measures to lessen the chances of something going wrong or not meeting expectations. "Avoid discouragement" is also a good synonym that emphasizes the importance of staying hopeful and positive. In any case, it's important to remember that disappointment is a natural part of life, and sometimes it can't be avoided entirely, but taking precautionary measures can certainly help.