Where does “gearbox” come from?

I need to work through this chain carefully, but I notice there are significant problems with it that make it impossible to write an accurate sentence. The chain as presented doesn't form a coherent etymological path for "gearbox": - "gearbox" is a modern English compound (gear + box) - The chain seems to trace "box" backwards, but then diverges into unrelated elements - The chain includes "βοῦς" (bous, meaning "ox/cow"), which doesn't semantically connect to "box" - The final elements (-kos, h₂er-) don't clearly lead to the word "box" - The chain appears corrupted or incorrectly assembled I cannot write an accurate etymology sentence because the chain itself doesn't support a clear derivation for "gearbox." To follow your rules properly, I would need either: 1. A corrected chain that

gearbox (English): An enclosed gear train; That part of a car's...