Gregarize means to form or join a group or herd. Some synonyms for this word include flock, congregate, assemble, gather, unite, band together, cluster, mass, and convene. These words all convey the idea of individuals coming together for a common purpose or goal. In a social or organizational context, they suggest a sense of community, solidarity, and collective effort. While gregarize has a somewhat clinical or biological connotation, these synonyms evoke a more dynamic and interactive image of people (or animals) actively collaborating, communicating, and cooperating with each other. Whether you're talking about birds, humans, or organizations, gregarizing is an essential aspect of social life and success.