Feast upon refers to the act of eating heartily or indulging in food to the fullest. There are many synonyms for this phrase that can be used in literature to express a similar idea. Some examples include gorging, devouring, devouring, scarfing, savoring, relishing, and indulging. Each of these words highlights the pleasure of enjoying food or partaking in a delicious meal. These synonyms can be used in different contexts, from a description of a lavish banquet to a quiet meal shared between friends. Whatever the context, these words all capture the joy and satisfaction that can come from a good meal.