Where does “rattle” come from?

I need to address a significant problem: the provided chain does not support the headword "rattle" (English). The chain traces a word meaning "pound" or "unit of weight" through Arabic, Greek, and Aramaic, but this etymological path does not lead to the English word "rattle" (a percussion instrument or rapid sound). I cannot write an accurate one-sentence origin summary for "rattle" using this chain, as doing so would violate the rule "State only what the chain supports. Do not invent dates, cognates, or intermediate steps." Could you verify whether: 1. The correct headword should be a different English word related to weight/pounds (like "pound")? 2. A different etymological chain was intended for "rattle"?

rattle (English): a sound made by loose objects shaking or...