The phrase "be in the hands of" implies that someone or something has control or authority over a situation or person. Other synonyms for this phrase include "rest with," "be at the mercy of," "be subject to," "be reliant on," "be under the control of," and "depend on." These phrases all convey a sense of powerlessness or dependence on another party. It is important to be mindful of the context when using these phrases, as they may carry different connotations depending on the situation. Overall, synonyms for "be in the hands of" help to communicate the idea of reliance or dependence on others in various circumstances.