Belong with is a phrase that communicates a sense of familiarity and attachment. There are several synonyms for belong with that can be used in different contexts. These include "complement," "fit in," "match," "mesh," "blend," and "harmonize." Each of these words implies that something is meant to be a part of a larger whole. The word complement suggests that something completes another thing. To fit in means that something is compatible or in sync with its surroundings. Similarly, a match means that there's a perfect fit between two things, while blend implies that something is seamlessly integrated. The words mesh and harmonize communicate a sense of cohesiveness and alignment. Ultimately, all these words convey a message of unity and coexistence.