"Holds onto" is a common phrase that means to keep or maintain something, such as a grip on an object or a firm grasp on a belief. Other synonyms for this phrase include clings, grips, grasps, clutches, embraces, and hangs on to. These words imply a strong sense of attachment or persistence, often indicating a reluctance to let go or a determination to keep something secure. In a figurative sense, "holds onto" can also signify a sense of control or influence, as in someone who holds onto power or authority. Ultimately, the choice of synonym depends on the context and intended meaning of the phrase.