berceuse (n.)youdaoicibaDictYouDict[berceuse 词源字典]
"cradle song," 1876, from French berceuse "cradle-song, woman who rocks an infant," from bercer "to rock" (Old French bercier "to rock" a child in a cradle, 12c.) + fem. agent suffix -euse.[berceuse etymology, berceuse origin, 英语词源]