bolero (n.)youdaoicibaDictYouDict[bolero 词源字典]
kind of Spanish dance, 1787, from Spanish, probably from bola "ball" (and perhaps with reference to "whirling motion"), from Latin bulla (see bull (n.2)). In reference to a type of short jacket, it is recorded by 1864.[bolero etymology, bolero origin, 英语词源]