marshal: [13] Etymologically, a marshal is a ‘horse-servant’. The word goes back to a prehistoric Germanic *markhaskalkaz ‘groom’, a compound based on *markhaz ‘horse’ (source of English mare [OE]) and *skalkaz ‘servant’. This was borrowed into late Latin as mariscalcus, and passed from there via Old French mareschal into English. In the course of its journey its status gradually rose, and by the time it reached English it denoted a ‘high officer of state’. => mare[marshal etymology, marshal origin, 英语词源]