bloodshed (n.)youdaoicibaDictYouDict[bloodshed 词源字典]
also blood-shed, c. 1500, "the shedding of (one's) blood," from verbal phrase (attested in late Old English), from blood (n.) + shed (v.). The sense of "slaughter" is much older (early 13c., implied in bloodshedding).[bloodshed etymology, bloodshed origin, 英语词源]