To learn information through informal channels, gossip, or unofficial sources rather than through direct or official communication.
This phrase originated during the American Civil War in the 1860s, referring to the 'grapevine telegraph' - a derogatory term for unreliable information networks. The comparison to grapevines emphasized how rumors twisted and turned as they passed from person to person, like the winding growth pattern of grape vines.
The grapevine metaphor is brilliantly chosen because grapevines grow in seemingly chaotic, intertwining patterns - just like gossip networks. What's remarkable is that modern network science has shown that informal information networks often follow similar patterns to biological systems, making this 19th-century metaphor surprisingly sophisticated in its understanding of information flow.
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