be on the same side
你跟高博是一伙的，是吧
You're in cahoots with Gao Bo, aren't you?
— Lost in Thailand (2012)
那家伙也是一伙的
That guy is in on it too.
— 哭声 (2016)
我们是一伙的
We're on the same side.
— 几近成名 (2000)
我回来就是告诉你如果我要是跟他是一伙的在机场我就不会跟你说有特务
I came back just to tell you that if I were working with him, I wouldn’t have told you there was a spy at the airport.