If you hear or learn something on the grapevine, you hear it or learn it in casual conversation with other people.
例句
He'd doubtless heard rumours on the grapevine...他無疑是聽到了小道消息。I had heard through the grapevine that he was quite critical of what we were doing.我聽到有傳言說他對我們在做的工作非常不滿。
N-COUNT
葡萄藤
A grapevine is a climbing plant on which grapes grow.
英漢詞典釋義
n.
傳聞, 小道消息
I heard about your success on the office grapevine.我聽到了辦公室的傳聞, 說你取得了成功。
通過小道消息；根據傳聞
I heard on the grapevine that you’re leaving.我聽小道消息說你要離開。
英英詞典釋義
Noun
1. gossip spread by spoken communication;
"the news of their affair was spread by word of mouth"
2. any of numerous woody vines of genus Vitis bearing clusters of edible berries