bombardier (n.)youdaoicibaDictYouDict[bombardier 词源字典]
1550s, soldier with a bombard, from French bombardier, from bombard (see bombard (n.)). In 17c.-18c. of soldiers who manned artillery (especially mortars and howitzers); meaning "one who aims the bombs in an aircraft" is attested 1932, American English.[bombardier etymology, bombardier origin, 英语词源]