The phrase "be dependent" typically refers to relying on someone or something for support or assistance. Synonyms for this phrase include "be reliant," "be subordinate," "be under someone's wing," "be in need," "be at the mercy of," and "be in thrall." These words are often used when describing situations in which one person or group has power and control over another. They can also be used to describe a relationship where one person is heavily dependent on another, or where a person requires support to survive. These synonyms provide a variety of ways to describe the same idea, adding depth and nuance to a writer's vocabulary.