【通风报信】〖tng fng bào xìn〗[send news secretly; furnish secret information; provide someone with information; send a secret message]

通真达灵互联网，

风举云飞寰球扬。

报往拔来视频递，

信息漏泄要严防。

把对立双方中一方的机密暗中告诉另一方。Put both sides middle of one party secret, in dark tell other one party.