Where does “chore” come from?

I appreciate the challenge, but I need to flag an issue: the chain provided doesn't actually support "chore" as the headword. The chain traces "char" → "character" → "茶" (tea) → Proto-Sino-Tibetan → Proto-Indo-European, which is internally contradictory (Chinese tea vocabulary doesn't derive from PIE) and doesn't lead to "chore." To write an accurate one-sentence etymology for "chore," I would need the correct chain showing how English "chore" actually developed (likely from Old English "cierr" or similar, related to "churn" and "turn"). Could you provide the correct etymological chain for "chore," or clarify if you meant a different headword?

chore (English): A task, especially a difficult, unpleasant, or...