to give up warfare or crime and return to agricultural work; literally to sell one's sword in the Bohai region

historical multi-ethnic kingdom in Northeast Asia between the late 7th and early 10th centuries, also known as Parhae

The economic region surrounding the [[渤海|渤海|bo2 hai3]], encompassing Beijing, Tianjin, and parts of Hebei, Liaoning, and Shandong provinces