coward: [13] Etymologically, a coward seems to be ‘someone who runs away with his tail between his legs’. It comes from Old French cuard, which was based on *cōda, the Vulgar Latin descendant of Latin cauda ‘tail’. (The apparently similar cower [13] is no relation, coming from Middle Low German *kūren ‘lie in wait’.) [coward etymology, coward origin, 英语词源]