vanguardyoudaoicibaDictYouDict[vanguard 词源字典]
vanguard: [15] Vanguards have nothing to do with guarding vans. The word denotes etymologically an ‘advance guard’. It is short for the long defunct avantgard, which was borrowed from Old French avant-garde, a compound formed from avant ‘in front’ and garde ‘guard’. (Its modern French descendant was reborrowed into English as avant-garde [20].)
=> avant-garde, guard[vanguard etymology, vanguard origin, 英语词源]
vanguard (n.)youdaoicibaDictYouDict
mid-15c., vaunt garde, from Middle French avant-garde, from avant "in front" (see avant) + garde "guard" (see guard (n.)). Communist revolutionary sense is recorded from 1928.