The phrase "be prostrate" means to lie face down on the ground, often as a sign of surrender, submission or worship. There are several synonyms for this expression, such as lying prone, lying flat, lying low or groveling. Another way to describe someone on their stomach is to say they are prone upon the ground. Other synonyms include being supine, stretched out, or face down in the dirt. Depending on the context in which the word is being used, there may be variations in what words could replace it. Overall, prostration indicates deference or surrender, and there are several words that can represent that meaning.