A member of an Irish protest organization of the 1760s called Hearts of Oak, whose badge was a sprig of oak worn in the hat.
Late 18th century; earliest use found in Richard Twiss (1747–1821), travel writer.
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。