shoulder: [OE] Shoulder is a general West Germanic word, with relatives in German schulter and Dutch schouder (it was also borrowed into Swedish and Danish as skuldra and skulder respectively). It goes back to a prehistoric *skuldr-, but where this came from is not clear. One suggestion is that it is distantly related to English shield, and originally denoted ‘shoulder-blade’ (the underlying meaning being ‘flat piece’). [shoulder etymology, shoulder origin, 英语词源]