Our first idiom is heard it on the grapevine.

我们的第一个习语，来自小道消息。

One theory is people thought the telegraph wires looked like the wires they use to train grapevines, so when they got a new message they'd say they heard it through the grapevine, or on the grapevine.

一种理论是，人们认为电报线看起来像他们用来牵引葡萄藤的线，所以当他们得到一个新消息时，他们会说他们是通过葡萄藤听到的（通过小道消息）可以用 through 或者 on。