Soon after the telegraph was invented the term 'grapevine telegraph' was coined - first recorded in a US dictionary in 1852. This distinguished the new direct 'down-the-wire' telegraph from the earlier method, which was likened to the coiling tendrils of a vine. It's clear that the allusion was to interactions amongst people who could be expected to be found amongst grapevines, that is, the rural poor. Read more about it here.
Today we use the phrase to mean we heard some information through an unofficial source.
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