Why is this idiom in so many languages? — The idiom ‘to kill two birds with one stone’ means to achieve 2 objectives with 1 action. It’s interesting to note that this idiom and its equivalent occur in many languages around the world. In Chinese, it’s 一石二鸟 (literally, 1 stone, 2 birds), 一箭双雕 (literally, 1 arrow, 2 eagles), or…