Prostrated oneself is a term that refers to the act of lying flat on the ground as a sign of submission or humility. There are other terms that can be used interchangeably with this phrase, including groveled, knelt, lay flat, bowed down, and fell on one's knees. These synonyms help to add variety to your writing and allow you to convey the same meaning in different ways. Depending on the context, one of these synonyms may be more appropriate than others. For example, groveled may be used to emphasize a sense of desperation or extreme submission, while kneeling might be used to show respect or devotion.