We don't have synonyms for passage grave yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are passage graves.
°A passage in text that is about a different subject from the preceding text, marked by commencing on a new line, the first line sometimes being indented.
°A passage in text that is about a different subject from the preceding text, marked by commencing on a new line, the first line sometimes being indented.