Keeping fast is a religious practice observed by many people around the world. It involves abstaining from food, drink, and sometimes other physical desires for a specific period. Although it is a simple phrase, there are several synonyms for keeping fast, such as fasting, abstinence, self-denial, restraint, moderation, and observance. Fasting is the most commonly used synonym, as it captures the essence of the practice. Abstinence and self-denial, on the other hand, highlight the sacrifice that one makes to adhere to the practice. Observance and restraint, meanwhile, emphasize the discipline and self-control that it requires. In short, keeping fast has several synonyms that capture different aspects of this religious practice.