There are plenty of synonyms for the phrase "go hand in hand" that can help us describe two things or ideas that are closely related or interconnected. Some possible synonyms for this phrase include "correlate," "coexist," "intersect," "overlap," "connect," "relate to," "influence each other," "be interconnected," and "be dependent on each other." All of these words imply a strong relationship between two things, whether they are concepts, actions, or objects. Using these synonyms can help us add variety and specificity to our writing, and communicate our ideas more clearly and effectively.