Grapevine原意为葡萄树、葡萄藤，现在常用来表示（秘密或谣言等）不胫而走。例如：

1. They were told to desist from spreading grapevine news.

已告诉他们停止散布小道消息。

2. I heard on the grapevine that you're leaving.

我听小道消息说你要离开。

hush hush 是形容词，意思是机密的，秘而不宣的。例如：

They managed to keep the scandal very hush hush but then a newspaper reporter found out about it.

他们试图使这件丑闻不被外泄，但后来被一位记者发现了。

by the grapevine通过小道消息得来

You must have heard it by the grapevine.

你一定是道听途说。

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