小道消息
news on (or through)the grapevine;back-alley news;hearsay; rumor
我听～说你提升了。I heard on the grapevine that you’ve been promoted./我们不能根据～或猜测作决定。We must not make a decision based on hearsay or guess-work.
小道消息xiǎo dào xiāo xī
比喻从非正式渠道听来的消息。hearsay, grapevine gossip