The grapevine is a word for gossip. Anything heard on the grapevine was learned by word of mouth.
A vine or climbing shrub, of the genus 
Noun
 gossip spread by spoken communication; "the news of their affair was spread by word of mouth"
Noun
 any of numerous woody vines of genus Vitis bearing clusters of edible berries
n.
 A vine or climbing shrub, of the genus Vitis, having
   small green flowers and lobed leaves, and bearing the fruit called
   grapes.
Grapevine
A vine or climbing shrub, of the genus 
Usage Examples
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