◎ To return the jade intact to the State of Zhao,meaning to return something to its owner in perfect condition.
Qin wanted to trade 15 cities for Heshibi,a piece of valuable jade in the possession of Zhao. Therefore,the King of Zhao sent Lin Xiangru to Qin with the jade. However,the King of Qin reneged on his promise after it was offered to him. Eventually,Lin managed to retrieve the jade and send it back to Zhao.(https://www.daowen.com)