"Lay in the grave" is a common phrase used to describe someone who has passed away and been buried. However, there are several synonyms for this phrase that can be used to express the same sentiment in different ways. One alternative is "rest in peace," which is often used on tombstones or in eulogies. "Pass away," "depart," and "go to one's final resting place" are also commonly used synonyms for "lay in the grave." Additionally, some people may use more figurative language to describe someone's passing, such as "crossing over," "ascending to heaven," or "transitioning into the afterlife." Ultimately, the choice of wording can depend on personal preference and cultural or religious traditions.