1US the eastern bluebird, Sialia sialis, which has blue upperparts and a chestnut breast (now historical).
2(Usually with distinguishing word) any of several Old World chats of the genus Luscinia (family Muscicapidae), which have blue upperparts.
Early 19th century.
英汉双解词典包含464360条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。