grape·vine 
/ˈgreɪpˌvaɪn/ noun
plural grape·vines /ˈgreɪpˌvaɪn/ noun [count] 1 : a climbing plant on which grapes grow 2 : an informal way of spreading information or rumors through conversation — usually singular ▪ The office grapevine isn't always a reliable source of information. ▪ I heard about the new position through the grapevine. ▪ The word on the grapevine is that a new treatment has been discovered.
