道听途说
Hear something over (throught) the grapevine.
A traveller's tale.
eg：I hear over the grapevine that you are moving to Shanghai.
中英俚语俗语来源：论语·阳货：“道听而途说，德之弃也。”
同义词：街谈巷议 Way-side inn gossips.
反义词：言之凿凿 Straight from the horse's mouth.
