Idiom Definition:
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"to hear it on the grapevine"
to hear or learn of something informally (and thereby not necessarily accurately or representative of the truth) - usually, though not always, verbally
Synonyms:
account, babble, blather, buzz, chatter, chit-chat, clothesline, conversation, dirt, earful, fiction, hearsay, innuendo, meddling, news, prate, prattle, report, rumble, rumor, scandal, scuttlebutt, story, tale, talk, tattle, tidings, whisper, wire