If you hear or learn something onthe grapevine, you hear it or learn it in casual conversation with other people. n-sing usu on/through the N
He'd doubtless heard rumours on the grapevine..., I had heard through the grapevine that he was quite critical of what we were doing.
Translation English Cobuild Collins Dictionary
on the grapevine ; through the grapevine
used to refer to the circulation of rumours and unofficial information
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