grape vine
柯林斯词典
1. N-SING If you hear or learn something on or through the grapevine, you hear it or learn it in casual conversation with other people. (消息、传闻等的) 私下传播途径
I had heard through the grapevine that he was quite critical of what we were doing. 我已经私下听说他对我们的工作十分挑剔。
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