The phrase "bound up" can be used to convey a sense of being tightly connected or intertwined with something or someone. Some synonyms for this phrase include "intertwined," "entwined," "interconnected," "linked," and "related." These words suggest a strong connection between two or more things, often in a way that cannot be easily separated. Similarly, "bound up" can also mean being constrained or restricted in some way. Synonyms for this meaning include "limited," "constrained," "restrained," "restricted," and "bound." These words imply a sense of being held back or restricted in one's actions or choices.