The phrase "holding on" can be expressed in a variety of ways using synonyms. Words such as "clinging," "grasping," "gripping," "clasping," and "embracing" all convey the idea of holding onto something firmly. Other options to describe holding on might include "retaining," "supporting," or "sustaining." At times, "enduring" can also be used, suggesting that someone is holding on despite challenges or obstacles. Alternatively, "persisting" might be used to convey a sense of continued effort. "Adhering" and "sticking" might also be used to suggest that someone is holding on despite difficulties. There are countless synonyms to describe the act of holding on, each with its own unique connotations and shades of meaning.