hear (something) through/on the grapevine idiom
从传闻中听说，通过道听途说获悉，听小道消息知道
to hear news from someone who heard the news from someone else
I heard through the grapevine that he was leaving - is it true? 我听到传闻说他要离开了——是真的吗？
英汉双解词典收录81607条英汉双解翻译词条，基本涵盖了全部常用单词的读音、翻译及用法，是英语学习的有利工具。