batman
/ˈbætmən/noun
(pl. -men /-mən/)
- dated (in the British armed forces) an officer's personal servant〈旧〉（英国部队中军官的）勤务兵, 传令兵。
词源
mid 18th cent. （originally denoting an orderly in charge of the bat horse 'pack-horse' which carried the officer's baggage）： from Old French bat （from medieval Latin bastum 'packsaddle'） + MAN.