Where does “intergroup” come from?

I need to flag a significant problem with this etymological chain before attempting the sentence. The chain provided is internally inconsistent and appears corrupted: - It jumps from Latin "volvere" (meaning "to turn") to Proto-Indo-European "grewb-" with no explanation of how these connect - "volvere" does not etymologically derive from "grewb-" - The chain repeats "ger-" three times at the end without explanation - "Italian gruppo" does not derive from Latin "volvere" The actual etymology of "group" traces through French "groupe" and Italian "gruppo" to an obscure origin, possibly from Germanic or from imitative origins—not through Latin "volvere." **I cannot write an accurate one-sentence summary from this chain** because doing so would violate the core rule: "State only what the chain supports. Do not invent dates

intergroup (English): Taking place between groups, especially between...