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• grapevine／うわさ、口づて、 口コミ、流言（used to refer to the circulation of rumors and unofficial information／A usually unrevealed source of confidential information／a private or secret source of information／an informal communications network）「hear something on/through the grapevine」という形でイディオム（人づてに聞く：to hear news from someone who heard the news from someone else）。
  • I'd heard through the grapevine that the business was nearly settled.
  • I heard about his resignation on the grapevine.　※resignation／辞職
  • I heard on the grapevine that Sam is moving to the east.
  • I heard on the grapevine that she was pregnant, but I don't know anything more.