The phrase "hold fast to something" is commonly used to mean to remain firmly attached or devoted to an idea or belief. Some synonyms for this phrase include clinging, grasping, gripping, embracing, adhering, and clutching. To cling to something means to hold onto it tightly, while grasping refers to holding something firmly in one's hands. Gripping implies a strong and forceful hold, while embracing suggests a strong attachment or affection. Adhering and clutching both convey the idea of holding onto something tightly and not letting go. In essence, all of these synonyms speak to the importance of a steadfast commitment and loyalty to a particular principle or belief.