The phrase "lay grave" can be replaced with several synonyms, depending on the context and tone of the statement. "Inter," "bury," and "entomb" all convey the idea of placing a body in the ground or a tomb. "Heap earth," "cover with dirt," and "fill in a grave" describe the physical act of creating a burial site. Alternatively, "commit to the earth," "lay to rest," or "say farewell" may be used for a more solemn or poetic tone. In any case, the words chosen will help set the mood and convey the appropriate level of reverence for those who have passed on.