buckler (n.)youdaoicibaDictYouDict[buckler 词源字典]
"small, round shield used to ward off blows," c. 1300, from Old French bocler "boss (of a shield), shield, buckler" (12c., Modern French bouclier), from Latin *buccularius (adj.) "having a boss," from buccula (see buckle (n.)).[buckler etymology, buckler origin, 英语词源]